著者

加藤 秀起 古賀 佑彦 向山 隆史 戸松 弘孝 鈴木 友輔 鈴木 昇一

出版者

日本保健物理学会

雑誌

保健物理 (ISSN:03676110)

巻号頁・発行日

vol.44, no.4, pp.380-386, 2009 (Released:2011-01-12)

参考文献数

7

被引用文献数

3

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In one of the accidents that might happen in the nuclear power station, there is a contamination accident caused by radioactive corrosion products during a periodic inspection. It is necessary to presume the skin absorbed dose from the adhesion area and the contamination density to forecast the level of the skin hazard by the adhesion of the radioactive substance. However, the data to forecast the local skin dose when the radioactive substance adhered handily is not maintained. In this paper, the absorbed dose in the skin surface neighborhood contaminated by radioactive corrosion products was calculated, and the relation between the adhesion area and the contamination density and the local absorption dose was derived. And, the approximate equation that forecast the integrated dose was derived from these data. As for the absorbed dose rate in depth 70 μm from the skin surface that became the index of the skin hazard, the contribution rate by 59Fe was the highest within 30 days, and the contribution of 60Co rose most after the 30th after the radioactive substance had adhered when the contamination density the adhesion area was the same. The relation between the initial contamination density and days that required it was graphed to reaching to the threshold by the integrated dose when the threshold dose in which the necrosis of the skin was caused was assumed to be 20 Gy. The absorbed dose commitment can be presumed from measurements of the contamination density by using this graph or the approximate equation.

著者

加藤 秀起 津坂 昌利 小山 修司 前越 久

出版者

公益社団法人 日本放射線技術学会

雑誌

日本放射線技術学会雑誌 (ISSN:03694305)

巻号頁・発行日

vol.54, no.5, pp.615-623, 1998

参考文献数

16

被引用文献数

1 1

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An x-ray spectrum measured by a semiconductor detector is different from the incident x-ray spectrum to the detector, because of distortions caused by energy-dependent responses of the detector and statistical and electrical fluctuations in the signal amplifying process. In this paper, we discuss a method for correcting the statistical and electrical fluctuations of the x-ray spectrum, using the unfolding method with a function based on the Gaussian distribution. Unfolding the measured x-ray spectrum by this method, K-α and K-β characteristic x-rays were clearly separated into two line spectra, and energy resolution was improved. The unfolding method, when used to supplement the stripping method that is generally applied to x-ray spectra correction, will provide enhanced correction of x-ray spectra.

著者

津坂 昌利 小山 修司 前越 久 加藤 秀起

出版者

公益社団法人日本放射線技術学会

雑誌

日本放射線技術學會雜誌 (ISSN:03694305)

巻号頁・発行日

vol.50, no.8, 1994-08-01

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診断用X線のような低エネルギー領域の一次X線スペクトル測定では, 細いX線ビームを検出面中央に垂直に入射して測定する.このためGe結晶は直径10mm, 厚さ7mm程度あれば問題はない.今回検討したクローズドエンド型は, 大結晶を有し, 分解能はやや劣るものの, 診断用X線, 漏洩X線, 室内散乱線等のスペクトル測定用としても使用できる可能性がある.しかし, 測定した波高スペクトルは必ず補正してX線エネルギースペクトルを求める必要がある.