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タイトル: | 17 Mev 竝に 6.1 Mev γ線の二,三物質による吸收係数の測定 |
その他のタイトル: | Measurements of Absorption Coefficients of 17 Mev and 6.1 Mev γ-Rays in Several Elements |
著者: | 植村, 吉明 |
著者名の別形: | Uemura, Yoshiaki |
発行日: | 30-Sep-1950 |
出版者: | 京都大学化学研究所 |
誌名: | 京都大学化学研究所報告 |
巻: | 22 |
開始ページ: | 18 |
終了ページ: | 30 |
抄録: | The γ-ray absorption coefficients of Pb, Sn, Cu, and Al were measured for the 17.6 Mev and 6.1 Mev γ-rays produced at the first proton resonance of the (Li-p) and (F-p) reactions respectively. The experimental arrangement used is shown in Fig. 1. In order to obtain the homogeneity of γ-rays, a filter to absorb the x-rays from the target by proton bombardment was not used near the target and each sample used had a diameter which was enough to cover the outside of the canalizing lead slit. Therefore, to detect the γ-rays, a thick lead plate was used in front of the window of the G-M counter of end-window type. The thickness of the plate was 7.5mm and 5.9mm for the 17.6 Mev and 6.1 Mev γ-rays respectively. To exclude the stray radiation, a set of canalizing lead slit and plug was placed upon the lead counter which was housed in a large lead box. Then the difference of counts with and without the lead plug for each sample is taken to be the true decrement of the γ-rays through the canal due to the absorption by the substance. Furthermore, in order to monitor the γ-ray intensity, a 6.5 mm lead counter shielded by a lead cylinder was placed in such a position that suffers no effect by the conditions of the sample. The absorption coefficients obtained under these conditions are given as follows: [Table omitted] Analysing these experimental data, the absorption due to the creation of electron pairs seems to be proportional to Z2 in the case of the 17.6 Mev γ-rays. However, it is to be noted that the absorption coefficient of Al for the 17.6 Mev γ-rays is found to be larger than the theoretical value. |
URI: | http://hdl.handle.net/2433/74165 |
出現コレクション: | 22集 |
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