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KMID : 0974620000180020017
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Bulletin of Dongnam Health University
2000 Volume.18 No. 2 p.17 ~ p.32
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A Study on Scattered Ray in Pb of Ir0192 Gamma Ray
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李寅子/Lee, In Ja
李厚敏/金學聖/朱光泰/Lee, Hoo Min/Kim, Hark Sung/Joo, Kwang Tae
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Abstract
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Transmission scattered ray of ¡-ray classified by Pb thickness was as follows:
1. This study explored the transmission scattered ray classified by Pb shield thickness using Electrometer, GM survey meter and Pocket dosimeter. It was shown that the scattered ray content in transmitted ray decreased for the following two cases : as the thickness of Pb shield increased, and the distance between ¡-ray source and Pb shield increased.
However, in case of GM survey meter, when the distance between central source and detector was vertical, the thickness of Pb shield did not have a significant relationship with scattered ray content in transmitted ray.
2. The ¡-ray dose change classified by lateral distance between central ray and detector was compared. For electrometer, when the distance between ¡-ray source and Pb shield was 27.5cm, the scattered ray content in transmitted ray increased. In this case, lateral distances were 5cm.and 10cm.
Additionally, as lateral distance increased when the distances between ¡-ray source and Pb shield were 17.5cm and 37.5cm. So did the scattered ray content in transmitted ray.
In case of pocket dosimeter and GM survey meter, as the distance between ¡-ray source and the detector went up and a ¡-ray sources and Pb shield increased, ¡-ray dose decreased.
3. Absorption rate of ¡-ray by Pb shield a showed a peak value when the Pb thickness was 5.6mm. In addition, as the Pb thickness increased absorption rate went down.
4. The half value layer of Ir-192 was 2.38mm Pb.
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