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JAEA Reports

Applicability evaluation of Type A transport container for off-site transportation of small-amount of fuel debris

Sakamoto, Masahiro; Okumura, Keisuke; Kanno, Ikuo; Matsumura, Taichi; Terashima, Kenichi; Riyana, E. S.; Mizokami, Masato*; Mizokami, Shinya*

JAEA-Research 2024-017, 14 Pages, 2025/03

JAEA-Research-2024-017.pdf:1.34MB

In the TEPCO's Fukushima Daiichi Nuclear Power Station (1F), a trial retrieval of fuel debris with small-amount from Unit 2 is planned. The retrieved fuel debris will be transported out of 1F to Institutes in Ibaraki prefecture for analysis. The analyzed results will be utilized for the improvement of the processes (retrieval, transportation and storage) in the fuel debris management as feedback, and also for the development of technologies necessary in the future. The weight of fuel debris in the trial retrieval is planned to be a few grams. After the trial, the scale of retrieval will be expanded step by step. In the trial retrieval, a rational transportation container should be considered beforehand, according to the laws and regulations associated with the off-site transportation. The transportation container has a classification and the classification is decided according to the radioactivity of the material in the container. In this report, we evaluated the applicability of the Type A transport container to contribute to the safety assessment of retrieved fuel debris.

Journal Articles

Development of a theoretical scaling factor method for the inventory estimation of difficult-to-measure nuclide Cs-135 in fuel debris and radioactive wastes

Sakamoto, Masahiro; Okumura, Keisuke; Kanno, Ikuo; Matsumura, Taichi; Terashima, Kenichi; Riyana, E. S.; Kaneko, Junichi*; Mizokami, Masato*; Mizokami, Shinya*

Journal of Nuclear Science and Technology, 10 Pages, 2025/00

https://doi.org/10.1080/00223131.2025.2478926

Times Cited Count：0

Journal Articles

Preliminary study of the criticality monitoring method based on the simulation for the activity ratio of short half-life noble-gas fission products from fuel debris

Riyana, E. S.; Okumura, Keisuke; Sakamoto, Masahiro; Matsumura, Taichi; Terashima, Kenichi; Kanno, Ikuo

Journal of Nuclear Science and Technology, 61(2), p.269 - 276, 2024/02

https://doi.org/10.1080/00223131.2023.2300773

Times Cited Count：0 Percentile：0.00(Nuclear Science & Technology)

Journal Articles

Simulation study on unfolding methods for diagnostic X-rays and mixed rays

Hashimoto, Makoto; Otaka, Masahiko; Ara, Kuniaki; Kanno, Ikuo; Imamura, Ryo*; Mikami, Kenta*; Nomiya, Seiichiro*; Onabe, Hideaki*

Journal of Nuclear Science and Technology, 46(1), p.76 - 82, 2009/01

https://doi.org/10.3327/jnst.46.76

Times Cited Count：0 Percentile：0.00(Nuclear Science & Technology)

A photon detector for unfolding X-ray energy distribution has been previously reported. Simulation studies on the unfolding method for this detector are discussed for diagnostic X-rays and mixed-source rays of $^{137}$ Cs/ $^{60}$ Co. Response functions for diverse diagnostic X-rays are almost indistinguishable and an unfolding using error reduction method is not sufficiently worked. The spectrum surveillance method is effective in this case. However, a simple error reduction method is useful for mixed rays. For both techniques, the neural network method is promising.

Journal Articles

InSb cryogenic radiation detectors

Kanno, Ikuo*; Hishiki, Shigeomi*; Sugiura, Osamu*; Xiang, R.*; Nakamura, Tatsuya; Katagiri, Masaki

Nuclear Instruments and Methods in Physics Research A, 568(1), p.416 - 420, 2006/11

https://doi.org/10.1016/j.nima.2006.06.009

Times Cited Count：17 Percentile：73.47(Instruments & Instrumentation)

no abstracts in English

JAEA Reports

Basic study on the development of low exposure CT with Frisch grid avalanche diode, JAERI's nuclear research promotion program, H13-011 (Contract research)

Imanishi, Nobutsugu*; Ito, Akio*; Kanno, Ikuo*; Yoshida, Koji*; Onabe, Hideaki*

JAERI-Tech 2005-007, 45 Pages, 2005/03

JAERI-Tech-2005-007.pdf:6.84MB

no abstracts in English

Journal Articles

Use of liquid helium-3 as a neutron converter for a semiconductor-based neutron detector

Nakamura, Tatsuya; Katagiri, Masaki; Aratono, Yasuyuki; Kanno, Ikuo*; Hishiki, Shigeomi*; Sugiura, Osamu*; Murase, Yasuhiro*

Nuclear Instruments and Methods in Physics Research A, 529(1-3), p.399 - 401, 2004/08

https://doi.org/10.1016/j.nima.2004.05.019

Times Cited Count：1 Percentile：10.16(Instruments & Instrumentation)

We evaluated the neutron-detection characteristics of a cryogenic neutron detector operating at 1.6 K, which comprises a liquid helium-3 as a neutron converter and an InSb semiconductor detector. The InSb semiconductor detector detected the protons created in the nuclear reaction $^{3}He + n rightarrow p + T$ in the liquid helium-3, where the density of that is ~600 times larger than that of the gaseous helium-3 at room temperature.

Journal Articles

Cryogenic neutron detector by InSb semiconductor detector with high-density helium-3 gas converter

Nakamura, Tatsuya; Katagiri, Masaki; Aratono, Yasuyuki; Kanno, Ikuo*; Hishiki, Shigeomi*; Sugiura, Osamu*; Murase, Yasuhiro*

Nuclear Instruments and Methods in Physics Research A, 520(1-3), p.76 - 79, 2004/03

https://doi.org/10.1016/j.nima.2003.11.225

Times Cited Count：8 Percentile：47.98(Instruments & Instrumentation)

The neutron-detection characteristics of a cryogenic neutron detector comprising an InSb semiconductor detector and a helium-3 gas converter were evaluated at a gas pressure of up to 12.5atm at 4.2K. The detector successfully detected stable neutrons under these conditions, where the density of the helium-3 gas is a few-hundred times higher than that at room temperature. It was found that the neutron detection efficiency was correlated with the gas pressure - even in a backward-detection configuration - in low-temperature, high-pressure helium-3.

Journal Articles

Schottky and pn junction cryogenic radiation detectors made of p-InSb compound semiconductor

Kanno, Ikuo*; Hishiki, Shigeomi*; Murakami, Haruko*; Sugiura, Osamu*; Murase, Yasuhiro*; Nakamura, Tatsuya; Katagiri, Masaki

Nuclear Instruments and Methods in Physics Research A, 520(1-3), p.93 - 95, 2004/03

https://doi.org/10.1016/j.nima.2003.11.229

Times Cited Count：2 Percentile：17.87(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Cryogenic neutron detector comprising an InSb semiconductor detector and a supercritical helium-3 gas converter

Nakamura, Tatsuya; Katagiri, Masaki; Aratono, Yasuyuki; Kanno, Ikuo*; Hishiki, Shigeomi*; Sugiura, Osamu*; Murase, Yasuhiro*

Review of Scientific Instruments, 75(2), p.340 - 344, 2004/02

https://doi.org/10.1063/1.1642747

Times Cited Count：6 Percentile：35.17(Instruments & Instrumentation)

We evaluated the neutron-detection characteristics of a proposed cryogenic neutron detector comprising an InSb semiconductor detector and a helium-3 gas converter. The neutron detector was operated at 4.2 K with helium-3 gas filling up to 1.5 atm, at which the density of the helium-3 nucleus corresponds to that at 160 atm at room temperature. The secondary particles generated by the $^{3}$ He(n,p) T reaction were successfully detected by the InSb detector with a time response of 80 nsec at all tested gas pressures.

Journal Articles

Radiation measurements by a cryogenic junction InSb detector with operating temperatures up to 115 K

Kanno, Ikuo*; Yoshihara, Fumiki*; Nouchi, Ryo*; Sugiura, Osamu*; Murase, Yasuhiro*; Nakamura, Tatsuya; Katagiri, Masaki

Review of Scientific Instruments, 74(9), p.3968 - 3973, 2003/09

https://doi.org/10.1063/1.1599067

Times Cited Count：18 Percentile：65.14(Instruments & Instrumentation)

junction-type radiation detectors were fabricated with an InSb substrate. The detectors had 1000 times higher resistances than the ones of the previously reported Schottky-type detectors. The output pulses of the preamplifier were analyzed from the point of view of the contribution of electrons and holes. The energy spectra of $^{241}$ Am alpha particles were measured at operating temperatures of up to 115 K. The inherent voltage of the detector was estimated.

Journal Articles

Undoped-type InSb radiation detector with rapid rise time

Hishiki, Shigeomi*; Kanno, Ikuo*; Sugiura, Osamu*; Murase, Yasuhiro*; Nakamura, Tatsuya; Katagiri, Masaki

Radiation Detectors and Their Uses, p.113 - 117, 2003/00

We fabricated the schottkey-type InSb semiconductor radiation detector using an undoped InSb substrate, and evaluated the charactersitics of the alpha particle detection. The InSb detectors detected alphar particles successfully at all the tested temperature from 4.2 to 115 K. The 10-to-90% rise times of the preamplifier outputs were about 350 nsec regardless of the operating temperature. These fast rise times were about 20 times improved comparing to those from p-type InSb semiconductor detector.

Journal Articles

Research of superconducting tunnel junction X-ray detectors with direct signal observation method using a fast current readout system

Kishimoto, Maki; Katagiri, Masaki; Nakamura, Tatsuya; Okubo, Masataka*; Ukibe, Masahiro*; Kurakado, M.*; Kanno, Ikuo*; Fukuda, Daiji*; Takahashi, Hiroyuki*; Kraus, H.*; et al.

Nuclear Instruments and Methods in Physics Research A, 444(1-2), p.124 - 128, 2000/04

https://doi.org/10.1016/S0168-9002(99)01343-1

Times Cited Count：4 Percentile：36.39(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Charged particle emissions in fission process

Ikezoe, Hiroshi; Shikazono, Naomoto; Nagame, Yuichiro; Otsuki, Tsutomu*; Sugiyama, Yasuharu; Tomita, Yoshiaki; Ideno, K.; Kanno, Ikuo; H.J.Kim*; B.J.Qi*; et al.

Nuclear Physics A, 538, p.299C - 306C, 1992/00

no abstracts in English

Journal Articles