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Takada, Chie; Nakano, Masanao; Munakata, Masahiro; Yoshida, Tadayoshi; Yokosuka, Yoshiyuki; Yamada, Junya; Maeda, Eita; Watanabe, Yuki; Tomioka, Akifumi; Momose, Takumaro
no journal, ,
no abstracts in English
Takada, Chie; Nakano, Masanao; Munakata, Masahiro; Yoshida, Tadayoshi; Yokosuka, Yoshiyuki; Yamada, Junya; Maeda, Eita; Watanabe, Yuki; Tomioka, Akifumi; Momose, Takumaro
no journal, ,
no abstracts in English
Morishita, Yuki; Tomioka, Akifumi; Fujisawa, Makoto; Izaki, Kenji
no journal, ,
It is important to differentiate between natural and artificial radioactive materials such as plutonium in nuclear facilities. In this study, a scintillator-based alpha-particle detector was developed using YAP:Ce scintillator and Multi-Anode PhotoMultiplier Tube. The detector was used to measure various naturally occurring radioactive materials (NORM) samples including radon progeny, lead plate, lantern mantle, and radium ball. The measurement results were compared with Monte Carlo simulation calculations and were found to be in agreement. The energy resolution of the detector is 8.6%FWHM. In the measurement results of radon progeny, peaks of 
Bi (6.1 MeV), 
Po (7.7 MeV), and Po (8.8 MeV) can be observed. The lead plate contains 
Po and emits 5.3 MeV alpha particle. The simulation with the same energy was able to reproduce the actual measurement. The results showed the energy and distribution of the alpha particles emitted by the NORM samples. The study successfully demonstrated the capability of the developed alpha-particle detector in identifying NORM.
Tomioka, Akifumi; Fujisawa, Makoto; Izaki, Kenji; Shioya, Satoshi
no journal, ,
When body contamination occurs, decontamination is carried out basically by wiping with wet paper rag, pouring large amounts of running water, and using detergents such as neutral detergents. However, it can be said that these methods do not reflect much of the technological progress to date. For example, we believe that more efficient body decontamination can be achieved by applying new technologies of the beauty care and health care field. In this study, we evaluated the decontamination effects of multiple commercially available detergents and microbubble showers that are expected to have decontamination effects, through tests using a particulate visualization system and tests using radioactive substances.
Fujisawa, Makoto; Tomioka, Akifumi; Izaki, Kenji; Shioya, Satoshi
no journal, ,
It is important to predict the spread of radioactive materials attached to workers' bodies. We evaluated the degree to which contamination remained after wiping off protective gear and the degree to which contamination was dispersed when it was removed. In the test, we applied fluorescent paint that simulates radioactive substances to protective gear, wiped it off with a wet rag, and removed the gear. And we photographed the fluorescent paint with a camera and evaluated the decontamination effect of wiping and the spread of simulated contamination. As a result of the test, we were able to evaluate the degree to which the protective gear was contaminated.