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| The Study on Shielding Properties of Metal Materials to the Radionuclides |
| Received:September 18, 2016 Revised:October 29, 2016 |
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| DOI：10.7643/ issn.1672-9242.2016.06.003 |
| KeyWord:Nuclear terrorism Shield Radionuclides |
| Author | Institution |
| 何星星 |
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| 刘颖 |
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| 潘喆 |
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| 王亚淼 |
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| 杨毅 |
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| Abstract: |
| Objective Nuclear and radiological terrorism has increasingly become a major means of terrorist attack because of its relatively low cost, easy to put on and so on, nuclear terrorism and nuclear emergency has become an important issue facing humanity. In order to deal with the interference of shield which impact on monitoring and identification of radionuclides during the nuclear terrorism and nuclear emergency, the shielding properties of the metal materials were studied. Methods Three different sizes and materials of metal are used as shield to detect the shielding effect of them on the same radioactive source. Results It is found that the shield body have strong shielding effects on the gamma spectrum below 200keV, especially for several tens of keV weak peaks and the shielding performance of the same kind of metal is proportional to the thickness. But sometimes the shielding effect of 4mm aluminum cylinder is worse than that of 3mm steel tube. Conclusion Therefore, we should fully consider the effects of different materials and different sizes of shield on the absorption of radiation in the actual scene of the radioactive nuclear detection and identification, thus detect and identify radionuclides rapidly. It is of special significance for the monitoring of nuclear terrorism and nuclear emergency. |
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