Kyushu University Academic Staff Educational and Research Activities Database
List of Presentations
Kin Tadahiro Last modified date:2021.06.26

Associate Professor / Energy System Technology / Department of Advanced Energy Science and Engineering / Faculty of Engineering Sciences


Presentations
1. Tadahiro KIN, Machine learning in radiation metrology: Neutron spectrum unfolding and Gamma-ray spectrometry
, Consultancy Meeting on Machine Learning for Nuclear Data, 2020.12.
2. Katsumi AOKI, Tadahiro KIN, Md Kawchar Ahmed PATWARY, Kosuke YOSHINAMI, Masaya YAMAGUCHI, Masatoshi ITOH, Yukinobu WATANABE, Uncertainty estimation of conventional neutron-spectrum unfolding codes with Monte-Carlo based method, Symposium on Nuclear Data, 2019.11, Unfolding process has been applied to neutron spectra derivation of many measurement methods. Previously, many types of unfolding techniques have been developed. Many codes of them, however, cannot calculate uncertainty propagation, and thus uncertainty characteristics comparison of some codes has not been investigated. To solve this problem, we have developed an uncertainty estimation method based on Monte-Carlo technique. Moreover, we have investigated characteristics of uncertainty propagation of two unfolding codes, GRAVEL and MAXED. For demonstration, we measured a double-differential thick-target neutron yield (DDTTNY) of the C(d,n) reaction induced by 20-MeV deuterons with the multiple-foil activation method at Cyclotron and Radioisotope Center, Tohoku University. The measured data were analyzed by GRAVEL and MAXED, and their uncertainty propagation was estimated by using the present method. As a result, we found that the uncertainty of DDTTNY has neutron energy dependence, and the dependency trend is different between GRAVEL and MAXED codes..
3. Md Kawchar Ahmed Patwary, Tadahiro Kin, Katsumi Aoki, Naoto Araki, Kosuke Yoshinami, Kazuaki Tsukada, Estimation of patient dose from medical radioisotope 64Cu accumulated in liver, The 21st Cross Straits Symposium on Energy and Environmental Science and Technology (CSS-EEST21), 2019.11.
4. Hikaru Sato, Tadahiro Kin, Yukinobu Watanabe, Double-differential Energy Spectrum of Terrestrial Cosmic-ray Muons in the 100-340 MeV Range, 2019 IEEE Nuclear Science Symposium (NSS) and Medical Imaging Conference (MIC), 2019.10, We have developed a muon spectrometer named full absorption muon energy spectrometer (FAMES) that consists of plastic scintillators to measure cosmic-ray muon energy spectra in the low energy region from 100 to 340 MeV. The detection acceptance of zenith angle can be arbitrarily adjusted in the measurement of double-differential spectra. We measured the double-differential spectra at Chikushi Campus of Kyushu University in Japan by using FAMES. The measured spectra are in good agreement with the calculated ones with the PHITS-based analytical radiation model in the atmosphere (PARMA). From this result, we concluded that PARMA has a predictive power in the low energy range..
5. Tadahiro Kin, Jun Goto, Masumi Oshima, Machine Learning Approach for Gamma-ray Spectra Identification for Radioactivity Analysis, 2019 IEEE Nuclear Science Symposium (NSS) and Medical Imaging Conference (MIC), 2019.10, Gamma-ray spectrometry for radioactive analysis plays important role on environmental recovery after the Fukushima Daiichi Nuclear Power Plant Accident. A huge amount of debris should be analyzed to determine whether it has potential of secondary pollution or not. In the gamma-ray spectrometry, a screening process is required to determine measurement time to satisfy a prescribed accuracy. In the screening process, short time measurement of gamma-ray spectrum is conducted to estimate the measurement time. In the conventional radioactive analysis procedure, only photo peaks are counted and identified by human. If Compton component in the spectrum can be used, required time of the screening process will be around 10 times shorter than the conventional procedure. That is because total gamma-ray efficiency is around 10 times higher than photo-peak efficiency. We focus on machine learning to take the Compton component into the screening process for efficient measurement cycle without human. For the first step, we have developed a gamma-ray spectrum identification model using the machine learning in the present study. Architecture of the machine learning model is as follows: 1) Input layer having 4096 units is corresponding to a 4k-ch gamma-ray spectrum. 2) The model has two hidden layers having 170 and 40 units, respectively. 3) Output layer has 7 units corresponding to radioactive nuclides interested in the analysis. 4) Activation functions of all units in the hidden layers are ReLU. Softmax function is used for output layer. 5) Backpropagation method with the stochastic gradient descent method is adopted for learning process. A loss function used in the model is the categorical cross entropy. 6) A metrics to evaluate the model is accuracy which is the mean accuracy rate across all predictions for learning dataset. The accuracy for all learning dataset was more than 95% at 20 epochs. We concluded that the model can sufficiently predict a nuclide included in a spectrum..
6. M. K. A. Patwary, T. Kin1, K Yoshinami, K Aoki, M. Yamaguchi, Y. Watanabe, M. Itoh, Separation yield and DOTA labeling efficiency of 64Cu produced with accelerator-based neutrons, EPSM 2019, Engineering and Physical Sciences in Medicine, 2019.10.
7. Hikaru SATO, TadahiroKIN, Yukinobu WATANABE, Investigation of Environmental Cosmic-ray Muon Spectrum in Low Energy Region, Muographers 2019, 2019.09.
8. Naoya OKAMOTO, Tadahiro KIN, Yuta NAGATA, Hikaru SATO, Tomohiro KOMORI, Yu HORAI, Development of A Detector for Degradation of Infrastructure by Using Cosmic Ray Muon, Muographers 2019, 2019.09.
9. Naoya OKAMOTO, Tadahiro KIN, Yuta NAGATA, Hikaru SATO, Tomohiro KOMORI, Yu HORAI, Infrastructure Survey by Muography, Muographers 2019, 2019.09.
10. Tadahiro KIN, Rock-filled Dam Muography, Muographers 2019, 2019.09.
11. Tadahiro Kin, Naoto Araki, Md Kawchar Ahmed Patwary, Katsumi Aoki, Kosuke Yoshinami, Masaya Yamaguchi, Masatoshi Itoh, Yukinobu Watanabe, Production Method of Environmental Tracer Cs-132 by Accelerator-based Neutron, International Conference on Nuclear Data for Science and Technology 2019, 2019.05, Cesium-137 has been well-known as the most problematic nuclide in a nuclear accident. For instance, in the Fukushima Daiichi nuclear power accident, large amounts of radioactive nuclides were released into the environment. There are three dominant nuclides; 137Cs, 134Cs, and 131I. Among all, 137Cs is the dominant radiation source of the environment in these days because of its long half-life (T1/2 = 30 y). Huge effort has devoted to the study on the dynamics of cesium in soil to develop decontamination method or investigate pollution of agricultural crops and so on. In these study, short-time dynamics of cesium in soil is very important. Nevertheless, long half-life radioactive cesium; 137Cs has been using, because no short half-life radioactive cesium is available. Moreover, using unsealed 137Cs source requires careful management to avoid environmental pollution for long time. Although such difficulties are existing, it is clear that further study on cesium dynamics in the environment is important. To enhance these study, we have proposed a new environmental tracer, 132Cs. The dynamics in the environment is completely same as 137Cs, and the gamma-ray energy of 137Cs (662 keV) and 132Cs (668 keV) is very close. Cesium-132 can be produced via the 133Cs(n,2n) reaction by accelerator-based neutron. We have conducted a production experiment of the accelerator-based production method at CYRIC, Tohoku University, Japan. The accelerator-based neutron was generated by the C(d,n) reaction in thick carbon neutron converter by 30-MeV deuteron. A raw material made of Cs2CO3 was irradiated by the neutron and produced radioactivity of 132Cs was measured by a HP Ge detector. Then, to demonstrate its feasibility, the simple dynamics in a few spices of soil was investigated by using a NaI(Tl) detector. We found that sufficient radioactivity of 132Cs can be produced by a few uA of deuteron beam, and the dynamics can be clearly measured..
12. Katsumi Aoki, Tadahiro Kin, Md Kawchar Ahmed Patwary, Naoto Araki, Kosuke Yoshinami, Masaya Yamaguchi, Masatoshi Itoh, Yukinobu Watanabe, Development of MC-based uncertainty estimation technique of unfolded neutron spectrum by multiple-foil activation method, International Conference on Nuclear Data for Science and Technology 2019, 2019.05, Unfolding process plays an important role in neutron energy distribution measurement by means of
the multiple-foil activation method. We have developed an algorithm for estimating uncertainty of resultant
neutron distribution. For the demonstration of the algorithm, we have conducted an experiment to measure
thick-target neutron yield (TTNY) of the C(d,n) reaction induced by 20-MeV deuterons with the multiple-foil
activation method. The experiment was conducted at Cyclotron and Radioisotope Center, Tohoku University in
Japan. The obtained experimental data were analyzed by the algorithm. As a result, we found that uncertainty of
derived TTNY has dependency on neutron emission energy. In addition, the dependency is caused by excitation
functions of activation reactions. Therefore, we found the particular reactions causing large uncertainty in
TTNY. The result of present study shows that the algorithm can evaluate uncertainty and its causes..
13. Yukinobu Watanabe, Hiroki Sadamatsu, Shouhei Araki, Keita Nakano, Shoichiro Kawase, Tadahiro Kin1, Yusuke Iwamoto, Daiki Satoh, Masayuki Hagiwara, Hiroshi Yashima, Tatsushi Shima, Shinsuke Nakayama, Study of the Li(d, xn) reaction for the development of accelerator-based neutron sources, International Conference on Nuclear Data for Science and Technology 2019, 2019.05, Double-dierential neutron production cross sections (DDXs) for deuteron-induced reactions on Li
at 200 MeV were measured for emission angles ranging from 0 to 25 in steps of 5 by means of a time of
flight (TOF) method with EJ301 liquid organic scintillators at the Research Center of Nuclear Physics (RCNP),
Osaka University. The measured DDXs were compared to theoretical model calculations with the DEURACS
and PHITS codes and TENDL-2017 nuclear data. It was found that the DEURACS calculation is in better
agreement with the measured DDXs than the PHITS calculation, while TENDL-2017 fails to reproduce both
the spectral shape and magnitude of the measured DDXs for all angles..
14. Hayato Takeshita, Yukinobu Watanabe, Keita Nakano, Seiya Manabe, Katsumi Aoki, Naoto Araki, Kosuke Yoshinami, Tadahiro Kin, Nobuhiro Shigyo, Jun Koga, So Makise, Tamaki Yoshioka, Masaomi Tanaka, Takashi Teranishi, Neutron production from thick LiF, C, Si, Ni, Mo, and Ta targets bombarded by 13.4-MeV deuterons, International Conference on Nuclear Data for Science and Technology 2019, 2019.05, Double-differential thick target neutron yields from LiF, C, Si, Ni, Mo, and Ta targets bombarded by
13.4-MeV deuterons were measured by using an EJ-301 liquid organic scintillator at the Center for Accelerator
and Beam Applied Science, Kyushu University. The measured (d, xn) spectra were compared with the (t, xn)
spectra measured by the other group at the same incident energy per nucleon, or 6.7 MeV/u, and theoretical
model calculations by Particle and Heavy Ion Transport code System (PHITS) and DEUteron-induced Reaction
Analysis Code System (DEURACS). Some bumps are observed in the (d, xn) spectra for low-Z target elements,
while no specific structure was seen in the (t, xn) spectra. The PHITS calculation, in which the intra-nuclear
cascade of Liege (INCL) and generalized evaporation model (GEM) were used, generally overestimates neutron
spectra while the DEURACS calculation agrees with experimental ones fairly well..
15. Md Kawchar Ahmed Patwary, Tadahiro Kin, Katsumi Aoki, Naoto Araki, Kosuke Yoshinami, Yukinobu Watanabe, DDTTNY measurement of accelerator-based neutron via C(d,n) reaction by 30-MeV deuteron by means of multiple-foil activation method, 4th International Exchange and Innovation Conference on Engineering & Sciences (IEICES 2018), 2018.10.
16. Masaki Kamida, Tadahiro Kin, Naoto Araki, Katsumi Aoki, Yukinobu Watanabe, Masatoshi Itoh, Production of medical radioisotope 64Cu via the 64Zn(n,p) reaction with accelerator-based neutrons and chemical separation, ISRD2018 : International Symposium on Radiation Detectors and Their Uses, 2018.01.
17. Katsumi Aoki, Tadahiro Kin, Masaki Kamida, Naoto Araki, Yukinobu Watanabe, Determination of Accelerator-based Neutron Energy Distribution by means of Multiple-Foil Activation Method using GRAVEL, MAXED, and RooUnfold, ISRD2018 : International Symposium on Radiation Detectors and Their Uses, 2018.01.
18. Hikaru Sato, Tadahiro Kin, Yukinobu Watanabe, Development of Detection System for Measurement of Zenith Angular Differential Spectra of Low-energy Terrestrial Cosmic-ray Muon, ISRD2018 : International Symposium on Radiation Detectors and Their Uses, 2018.01.
19. Tadahiro Kin, Md. Kawchar Ahmed Patwary, Masaki Kamida, Katsumi Aoki, Naoto Araki, Kosuke Yoshinami, Yukinobu Watanabe, Masatoshi Itoh, Development of Radioisotopes Production Method by Accelerator-based Neutron: Activity at Kyushu University, ISRD2018 : International Symposium on Radiation Detectors and Their Uses, 2018.01, Recently, applications of accelerator-based neutron source have been widely expanding in various fields. Among all, we have focused on radioisotopes (RIs) production. The deuteron induced reactions on a thick target made of carbon or beryllium have large advantages to generate high intense neutron [1]. Moreover, since the neutron spectra induced by deuteron have a peak around a half of incident energy, the spectra can be adjusted to reduce amount of by-products, as reported in [2]. For the RI production, deuteron incident energy from 10 to 50 MeV is useful to suppress by-products, because above 50 MeV, too many uncontrollable reactions occur. To estimate quantity and quality of the RI product and to design radiation shielding, double differential thick target neutron yields (DDTTNYs) are required on carbon or beryllium targets for the energy region. However, there is no systematic experimental data available, so far. To overcome the situation, we have systematically measuring DDTTNYs at CYRIC, Tohoku University by means of the multiple-foil activation method. The measurements of the C(d,n) reaction at incident deuteron energies of 12, 16, 20, and 25 MeV and Be(d,n) reaction at those of 16 and 25 MeV were conducted. The DDTTNYs were determined by using unfolding technique from activity of irradiated multiple foils. The analysis method has been also developed by comparison of various conventional unfolding codes as well as an original artificial neural network unfolding code. In addition, production experiment and practical tests were performed for some of feasible RIs such as Cu-64 (a new PET nuclide), Mo-99 (mother of conventional SPECT nuclide Tc-99m), and Cs-132 (a new environmental tracer). We will show details of the analysis method to determine DDTTNYs for the C(d,n) reaction at incident deuteron energies of 12 and 20 MeV. Furthermore as an example of feasibility study, development of chemical process to recover highly enriched Mo-100 target in the Mo-99 production will be given in the presentation.
References
[1] Y. Nagai, et al., J. Phys. Soc. Jpn., 82 (2013) 1.
[2] T. Kin, et al., J. Nucl. Sci. Technol., 54 (2017) 1123..
20. Kullapha Chaiwongkhot, Tadahiro Kin, Ryo Sasaki, Hikaru Sato, Yuta Nagata, Tomohiro Komori, Yukinobu Watanabe, Demonstration of 3D Cosmic-ray Muon Tomography using Portable Muography Detector made of Plastic Scintillating Fibers, ISRD2018 : International Symposium on Radiation Detectors and Their Uses, 2018.01.
21. T. Kin, Y. Sanzen, M. Kamida, K. Aoki, N. Araki, Y. Watanabe, Artificial Neural Network for Unfolding Accelerator-based Neutron Spectrum by Means of Multiple Foil Activation Method, 2017 IEEE Nuclear Science Symposium & Medical Imaging Conference, 2017.10, Recently, applications of accelerator-based neutron are widely spread to many fields. Among all, we have focused on the medical RIs production. In the study, accelerator-based neutrons are generated by 10- to 40-MeV deuteron induced reactions on thick target made of C or Be. For design of irradiation system and estimation of production rate and purity, double differential thick target neutron yields (DDTTNY) are required. There are, however, not sufficient available data. Therefore, in the medical RI production study, the DDTTNY is necessary to be measured. We adopted the multiple foil activation method for the measurement. It is appropriate for the medical RI production study, because the direct activation power of the neutron source can be obtained. The DDTTNY should be derived by an unfolding technique from measured yields of atoms produced via the activation reactions. Performances of conventional unfolding codes are strongly dependent on the initial guess spectrum and a human-inducible parameter of convergence condition. We have developed an unfolding code using artificial neural network (ANN) which requires no initial guess spectrum and no human-inducible convergence condition. Once the ANN is trained, neutron spectrum can be derived from inputting yields of atoms produced via the activation reactions only. To demonstrate the ability to derive the DDTTNY by the ANN unfolding code, we input yields of produced atoms obtained by a multiple foil activation experiment conducted at Kyushu University Tandem Laboratory. The resultant DDTTNY is compared with that by GRAVEL code, which is one of the conventional codes. Since there is no large discrepancy, we found that the ANN unfolding code has same ability to GRAVEL code even without the initial guess spectrum..
22. H. Sato, T. Kin, Y. Watanabe, Investigation of Environmental Cosmic-ray Muon Spectrum in Low Energy Region, 2017 IEEE Nuclear Science Symposium & Medical Imaging Conference, 2017.10, Recently, potential of soft errors by cosmic-ray muon has been pointed out for state-of-the-art high-integrated devices. Since low energy muon can deposit sufficient energy even in the small sensitive region of the device, cosmic-ray muon spectrum in low energy region is important to estimate error rate. However, no measurement has been reported below 100 MeV. We have developed a muon detector system consists of plastic scintillators (PSs) to measure the low-energy cosmic-ray muon energy spectrum. The main cubic PS was sandwiched vertically by two plate-shaped PSs. To eliminate natural background radiation and electric noises, recorded events were filtered by coincidence condition of the main and upper PSs. The bottom PS was used as a veto detector to reject the muons penetrating the main PS. Under these conditions, signals by a muon stopped in the main PS were only acquired. The detectable maximum zenith angle and energy was limited by the detector geometry and the values are 45 degrees and 75 MeV, respectively. The experiment with the detector system was carried out at Chikushi Campus of Kyushu University. The energy dependent efficiency was derived by PHITS simulation to obtain absolute energy spectrum from measured counting rate. The obtained spectrum is in good agreement with the predicted one with EXPACS around 75 MeV in magnitude and shape. In lower energy region, however, the present flux is larger. Since our detector system cannot reject cosmic-ray electrons completely, their events are possibly included in the region. In the future, detection geometry will be improved to absorb or scatter the cosmic-ray electrons..
23. Tadahiro Kin, Muography Project at Kyushu University, MUOGRAPHERS 17 General Assembly, 2017.10.
24. Seiya Manabe, Yukinobu Watanabe, Wang Liao, Masanori Hashimoto, Keita Nakano, Hikaru Sato, Tadahiro Kin, Koji Hamada, Motonobu Tampo, Yasuhiro Miyake , Momentum and Bias Dependencies of Single Event Upsets Induced by Low-energy Negative and Positive Muons in 65-nm SOTB SRAMs, RADECS 2017, 2017.10, The first measurement of SEUs induced by low-energy negative and positive muons has demonstrated that the negative muon SEUs occur at higher rate than the positive muon ones because of negative muon capture process..
25. Wang Liao, Masanori Hashimoto, Seiya Manabe, Yukinobu Watanabe, Keita Nakano, Hikaru Sato, Tadahiro Kin, Koji Hamada, Motonobu Tampo, Yasuhiro Miyake, Measurement and Mechanism Investigation of Negative and Positive Muon Induced Upsets in 65nm Bulk SRAMs , RADECS 2017, 2017.10, Irradiation experiments of positive and negative muon were conducted on 65nm bulk CMOS SRAM. Our experimental results reveal that parasitic bipolar action (PBA) contributes to negative muon induced upsets. We observe an increase in SER at higher operation voltage under negative muon irradiation while positive muon shows an opposite decreasing tendency. In addition, MCU proportion in negative muon-induced upsets is up to 66%, and more than 20-bit MCU is observed. .
26. Masaki Kamida, Kin Tadahiro, Yukimasa Sanzen, Katsumi Aoki, Naoto Araki, Yukinobu Watanabe, Masatoshi Itoh, Production of medical isotope 92Y using the C(d,n) accelerator-based neutron source, the 18th Cross Straits Symposium on Energy and Environmental Science and Technology(CSS-EEST), 2016.12.
27. Hikaru Sato, Kin Tadahiro, Yukinobu Watanabe, Investigation of Lower-energy Distribution of Environmental Cosmic-ray Muon for Soft Error Estimation, the 18th Cross Straits Symposium on Energy and Environmental Science and Technology(CSS-EEST), 2016.12.
28. Yukimasa Sanzen, Kin Tadahiro, Masaki Kamida, Katsumi Aoki, Naoto Araki, Yukinobu Watanabe, Development of an artificial neural network code for unfolding neutron spectra measured by multiple foils activation method, 2016年 核データ研究会, 2016.11.
29. Tadahiro Kin, Muography at Kyushu University, MUOGRAPHERS 16 General Assembly, 2016.11.
30. Kin Tadahiro, Yukimasa Sanzen, Masaki Kamida, Yukinobu Watanabe, Masatoshi Itoh, Production of 92Y via the 92Zr(n,p) reaction using the C(d,n) accelerator neutron source, International Conference on Nuclear Data for Science and Technology 2016, 2016.09, Medical radioisotopes are widely applied not only for diagnostic but also therapeutic purposes.
In particular, radioimmunotherapy (RIT) plays an important role in cancer therapy in recent years.
Yttrium-90-ibritumomab tiuxetan is the first RIT agent approved by the U.S. Food and Drug Administration (FDA).
After that it has been approved in more than 40 countries.
Until Nov. 2011, assessment of biodistribution by using 111In-ibritumomab tiuxetan before administration of 90Y-ibritumomab tiuxetan (called “bioscan”) was required in United States, Japan and Switzerland. The FDA removed the bioscan at Nov. 2011 and the first reason was “analysis of data in 253 patients showed that the In-111 imaging dose and bioscan was not a reliable predictor of altered Y-90 ZEVALIN (the trade name of ibritumomab tiuxetan) bio-distribution”.
If ibritumomab tiuxetan is labeled with an Yttrium isotope, it has to be a reliable predictor.
Since gamma-ray imaging is used for the bioscan, gamma-ray emitter has to be used as the labelling nuclide.
There are a few Yttrium isotopes which emit gamma ray. Among all we focus on 92Y, because it has relatively-long half-life (3.5 h) and decays to a stable isotope (92Zr).
We propose a new method to produce 92Y using accelerator neutrons. Yttrium-92 is produced via the (n,p) reaction on 92Zr.
A feasibility experiment was performed at Cyclotron and Radioisotope Center in Tohoku University. A carbon thick target was irradiated by 20 MeV deuterons to produce accelerator neutrons.
The thick target neutron yield (TTNY) was measured by using the multiple foils activation method. The foils were made of Al, Fe, Co, Ni, Zn, Zr, Nb, and Au. The amount of 92Y production and induced impurities were estimated by simulation with the measured TTNY.
The details of the data analysis and the results are shown in the presentation..
31. Tadahiro KIN, Kullapha Chaiwongkhot, 大野 裕明, 近藤 和博, 渡辺 幸信, Measurement of Zenith and Azimuth Angular Differential Flux of Cosmic-ray Muons Using a Prototype Portable Muography Detector, International Symposium on Radiation Detectors and Their Uses, 2016.01, We have developed a prototype portable muography detector and applied it to measurement of zenith and azimuth angular differential fluxes of cosmic-ray muons on the ground..
32. Tadahiro KIN, 渡辺 幸信, Development of a Remote and Multipoint Air-dose Rate Monitoring System Using Webcams, 2015 IEEE Nuclear Science Symposium & Medical Imaging Conference, 2015.11, We propose a new webcam-based air-dose rate monitoring system, in which multiple webcams are driven remotely by a single PC..
33. Tadahiro KIN, 渡辺 幸信, Accelerator-based Neutron Source for Medical RI Production, the AFAD 6th Asian Forum for Accelerators and Detectors, 2015.01, Accelerator-based neutron sources have been used for various studies: fundamental physics, engineering application, medical application, and so on. Recently, the applications have been spread to medical RI production. In 2013, a new method for Generation of Radioisotopes (RI) with Accelerator Neutrons by Deuterons (GRAND) has been proposed.
In the method for GRAND, two types of neutron sources with deuteron-induced reactions have been considered: one is the DT reaction and the other is the C(d,n) or the Be(d,n) reaction. We focused on the latter reaction. For the reaction, deuterons are accelerated up to a few ~ 40 MeV and bombard on a neutron converter made of thick carbon or beryllium. Thick target neutron yields (TTNYs) of the reactions are very important to predict the amount of medical RIs, however, experimental data are not sufficient. We can simulate TTNYs with calculation codes e.g. PHITS, but the reproducibility is not satisfactory.
At the Kyushu University Tandem Accelerator, we have so far measured TTNYs of the X(d,n) reactions systematically (here, X= natC to 181Ta) not only to improve insufficient experimental data but also to modify/develop theoretical models. In addition, we have carried out some test experiments of medical RI production e.g. 58Co and 64Cu for positron emission tomography. At the end of FY2014, however, the accelerator will be shut down, and a new 8 MV Tandem accelerator is now in preparation to star up in FY 2015 at the Center for Accelerator and Beam Applied Science, Kyushu University. Now we have a plan to develop a dedicated beam line as a neutron source to proceed and expand our research work.
Our past relevant results and future plan will be reported in the forum.
.
34. 川越 敬也, Tadahiro KIN, 荒木 祥平, 渡辺 幸信, Measurement of neutron yield by foils activation unfolding method for medical radioisotopes production using accelerator neutrons, 2014 Symposium on Nuclear Data, 2014.11, Accelerator neutrons have been proposed to produce medical radioisotopes. The C(d,n) reaction is one of the candidates to produce neutrons. The data of thick target neutron yields (TTNYs) is needed for reliable prediction of the amount of production. We measured the angle-differential TTNYs of the C(d,n) reaction at Ed = 12 MeV using multiple-foil activation unfolding method. The spectral shape was in good agreement with previous experimental data. This demonstrates that the experimental method is applicable to prediction of the amount of medical radioisotopes produced with accelerator neutrons..
35. 荒木 祥平, Tadahiro KIN, 渡辺 幸信, 近藤 和博, 萩峯 恒樹, 執行 信寛, 相良 建至, NEUTRON PRODUCTION YIELD FROM A THICK ALUMIMUN TARGET IRRADIATED WITH 5 AND 9 MEV DEUTERONS, Cross Straits Symposium on Energy and Environmental Science and Technology 16, 2014.11, We measured double differential neutron yields from a thick aluminum target irradiated with 5 and 9 MeV deuterons at the Kyushu University Tandem accelerator Laboratory (KUTL). An NE213 liquid organic scintillator was used as neutron detector. The neutron events were analyzed by an unfolding technique. The experimental results were compared with theoretical model calculations with PHITS and TALYS codes..
36. K. Y. Hara, S. Goko, H. Harada, K. Hirose, A. Kimura, Tadahiro KIN, F. Kitatani, M. Koizumi, S. Nakamura, Y. Toh, M. Igashira, T. Katabuchi, K. Kino, Y. Kiyanagi, J. Hori, Response function for the measurement of (n,γ) reactions with the ANNRI-Cluster Ge detectors at J-PARC, 核データ研究会, 2013.11, For a new experimental setup, response functions of cluster-Ge detectors were measured with standard γ-ray sources, γ-rays of the 24Na β-decay, and prompt γ-rays of the 35Cl(n,γ)36Cl reaction in ANNRI at J-PARC/MLF. The experimental data and calculation with the EGS5 code are compared..
37. Nozomi Sato, Masako Kawabata, Yasuki Nagai, Kazuyuki Hashimoto, Yuichi Hatsukawa, Hideya Saeki, Shoji Motoishi, Tadahiro KIN, Kentaro Ochiai, Kosuke Takakura, Futoshi Minato, Osamu Iwamoto, Nobuyuki Iwamoto, Shintaro Hashimoto, 99Mo production by 100Mo(n,2n)99Mo using accelerator neutrons, 5th Asia-Pacific Symposium on Radiochemistry, 2013.09, We proposed a new route to produce a medical radioisotope 99Mo by the 100Mo(n,2n)99Mo reaction using accelerator neutrons. A high-quality 99Mo with a minimum level of radioactive waste can be obtained by the proposed reaction. The decay product of 99Mo, 99mTc, is separated from 99Mo by the sublimation method. The proposed route could bring a major breakthrough in the solution of ensuring a constant and reliable supply of 99Mo..
38. Hideo Harada, M. Ohta, A. Kimura, K. Furutaka, K. Hirose, K. Y. Hara, Tadahiro Kin, F. Kitatani, M. Koizumi, S. Nakamura, M. Oshima, Y. Toh, M. Igashira, T. Katabuchi, M. Mizumoto, K. Kino, Y. Kiyanagi, T. Fujii, S. fukutani, J. Hori, Capture Cross-section Measurement of 241Am(n,g) at J-PARC/MLF/ANNRI, International Conference on Nuclear Data for Science and Technology, 2013.03, Accurate determination of the neutron capture cross sections of radioactive nuclei is required in the fields of nuclear waste transmutation study and also nuclear astrophysics.
The accurate neutron-nucleus reaction measurement instrument (ANNRI), which was installed in the materials and life science experimental facility (MLF) at the J-PARC, is expected to satisfy these demands.
The capture cross section of 241Am was measured using a high efficiency Ge spectrometer installed in the ANNRI.
By taking advantage of its high gamma-ray energy resolution, background components were precisely subtracted.
The capture cross section of 241Am was deduced for a neutron energy region between 0.01 and 20 eV.
The obtained cross section and the Westcott factor are compared with the preceding experiments and evaluated values.
This work was supported by JSPS KAKENHI Grant Number 22226016..
39. K. Hirose, K. Furutaka, K. Y. Hara, H. Harada, J. Hori, M. Igashira, T. Kamiyama, T. Katabuchi, A. Kimura, Tadahiro Kin, K. Kino, F. Kitatani, Y. Kiyanagi, M. Koizumi, M. Mizumoto, S. Nakamura, M. Oshima, Y. Toh, Cross section measurement of 237Np(n,g) at J-PARC/MLF/ANNRI, International Conference on Nuclear Data for Science and Technology, 2013.03, Accurate determination of the neutron capture cross sections of radioactive nuclei is required in the fields of nuclear waste transmutation study and also nuclear astrophysics. The accurate neutron-nucleus reaction measurement instrument (ANNRI), which was installed in the materials and life science experimental facility (MLF) at the J-PARC, is expected to satisfy these demands. The capture cross section of 241Am was measured using a high efficiency Ge spectrometer installed in the ANNRI. By taking advantage of its high gamma-ray energy resolution, background components were precisely subtracted. The capture cross section of 241Am was deduced for a neutron energy region between 0.01 and 20 eV. The obtained cross section and the Westcott factor are compared with the preceding experiments and evaluated values. This work was supported by JSPS KAKENHI Grant Number 22226016..
40. S. Nakamura, A. Kimura, F. Kitatani, M. Ohta, K. Furutaka, S. Goko, K. Y. Hara, H. Harada, K. Hirose, Tadahiro Kin, M. Koizumi, M. Oshima, Y. Toh, K. Kino, F. Hiraga, T. Kamiyama, Y. Kiyanagi, T. Katabuchi, M. Mizumoto, M. Igashira, Cross Section Measurements of the radioactive 107Pd and stable 105,108Pd nuclei at J-PARC/MLF/ANNRI, International Conference on Nuclear Data for Science and Technology, 2013.03, Neutron-capture cross sections of Long-Lived Fission Products (LLFPs) are of great importance for predicting long-term characteristics of nuclear reactors. Palladium-107 is one of the important LLFPs because of its extremely long half-life (6.5x10^6 year) and fission yield (3% for Pu-239). Some Pd isotopes among LLFPs, e.g. 105,108Pd, are also listed as important absorbers for thermal and fast reactors.
From these points of view, we have started the measurements of the neutron-capture cross sections for stable 105, 108Pd nuclei as well as the radioactive 107Pd. The neutron-capture cross-section measurements by the time-of flight method were performed using an apparatus called “Accurate Neutron-Nucleus Reaction measurement Instrument (ANNRI)”installed at the neutron Beam Line No.4 of the Materials and Life science experimental Facility (MLF) in the J-PARC. The neutron-capture cross sections of 107Pd and 105, 108Pd have been measured in the neutron energy range from thermal to 300 eV. Some new information was obtained for resonances of these Pd nuclei.
In this talk, we will present results of these measurements at J-PARC/MLF/ANNRI.

Present study is the result of "Study on nuclear data by using a high intensity pulsed neutron source for advanced nuclear system"
entrusted to Hokkaido University by the Ministry of Education, Culture, Sports, Science and Technology of Japan (MEXT).
This work was supported by JSPS KAKENHI Grant Number 22226016..