Development of a large-area alpha imaging detector for hand and foot monitors

Morishita, Yuki; Higuchi, Mikio*; Kaneko, Junichi*; Kitagawa, Yuichi*; Akedo, Jun*; Soma, Mitsugu*; Matsui, Hiroaki*

Nuclear Instruments and Methods in Physics Research A, 1057, p.168702_1 - 168702_8, 2023/12

https://doi.org/10.1016/j.nima.2023.168702

This paper describes the development of a large-area imaging detector capable of measuring the detailed distribution of alpha particles on hands and feet for use in entry/exit control monitors in decommissioning sites such as the Fukushima Daiichi Nuclear Power Plant. The detector was developed using a commercially available ZnS(Ag) scintillator and an electron multiplying CCD camera. The effectiveness of the detector was evaluated by measuring several types of radiation sources, and the results showed that it was possible to detect the position of alpha particles in a very short time, and contamination levels of up to 11 Bq/cm could be visualized. As a result of the minimal detectable surface activity concentration evaluations, 2.0 minutes or more is required to achieve 4 Bq/cm, and 25.0 minutes or more is required to achieve 0.4 Bq/cm. The field of view of the detector was also checked, and it was confirmed that the setup had a field of view that could cover most of the hand and the sole of the shoe. This detector is expected to be useful for preventing internal uptake and decontamination.

Oxidation-reduction properties of mixed oxides in the cerium-uranium-oxygen system

Tagawa, Hiroaki; Fujino, Takeo; *; *; *

Bulletin of the Chemical Society of Japan, 54(1), p.138 - 142, 1981/00

https://doi.org/10.1246/bcsj.54.138

no abstracts in English

Determination of oxygen in ternary uranium oxides by a gravimetric alkaline earth addition method

Fujino, Takeo; Tagawa, Hiroaki

Analytica Chimica Acta, 107, p.365 - 371, 1979/00

https://doi.org/10.1016/S0003-2670(01)93228-3

no abstracts in English

Lattice parameter of uranium mononitride

; Tagawa, Hiroaki

Journal of Nuclear Materials, 79(1), p.264 - 266, 1979/00

https://doi.org/10.1016/0022-3115(79)90457-4

no abstracts in English

A Gravimetric method for the determination of oxygen in uranium oxides and ternary uranium oxides by addition of alkaline earth compounds

Fujino, Takeo; Tagawa, Hiroaki; ;

Analytica Chimica Acta, 98(2), p.373 - 383, 1978/02

https://doi.org/10.1016/S0003-2670(01)84067-8

no abstracts in English

Thermodynamics of MgUO by EMf measurements, 1; Properties at high magnesium concentrations

Fujino, Takeo; ; Tagawa, Hiroaki

Journal of Solid State Chemistry, 24(1), p.11 - 19, 1978/01

https://doi.org/10.1016/S0022-4596(78)90179-2

no abstracts in English

Phase transformation of strontium monouranate (VI)

Tagawa, Hiroaki; Fujino, Takeo

Journal of Inorganic and Nuclear Chemistry, 40(12), p.2033 - 2036, 1978/00

https://doi.org/10.1016/0022-1902(78)80197-3

no abstracts in English

Anomalous behavior in the to transition of SrUO

Tagawa, Hiroaki; Fujino, Takeo

Inorg.Nucl.Chem.Lett., 13(10), p.489 - 493, 1977/10

https://doi.org/10.1016/0020-1650(77)80017-2

no abstracts in English

Formation of uranium mononitride by the reaction of uranium dioxide with carbon in ammonia and a mixture of hydrogen and nitrogen, 1; Synthesis of high purity UN

; Tagawa, Hiroaki

Journal of Nuclear Materials, 71(1), p.65 - 72, 1977/01

https://doi.org/10.1016/0022-3115(77)90187-8

no abstracts in English

Nonstoichiometry in uranium sesquinitride

Tagawa, Hiroaki

JAERI-M 6874, 22 Pages, 1976/12

JAERI-M-6874.pdf:0.58MB

no abstracts in English