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MCNP妯℃嫙;纬灏勭嚎鏁ｅ皠;鍑嗙洿鍣?灞忚斀
涓浘鍒嗙被鍙凤細 聽TL81 聽 聽 聽 聽 聽 聽 聽 聽 聽 聽 聽 聽鏂囩尞鏍囪瘑鐮侊細 A
DOI锛?0.19694/j.cnki.issn2095-2457.2020.07.077
Abstract
MCNP4C program was used to simulate the relationship between the dose rate of 纬-rays after exposure to lead锛?1.34g/cm3锛夛紝 iron锛?.86g/cm3锛夛紝 concrete锛?.35g/cm3锛?and water锛?.00g/cm3锛?with and without collimator with the thickness of these materials in this paper锛?the results show that some 纬-rays are absobed by the material and some 纬-rays are scattered in the materials when 纬-rays penetrate the shielding materials锛?and different shielding materials have different absorption and scattering probability of 纬-rays.With the increase of the thickness of the shielding layer锛宻cattering takes up a larger share of the dose rate received by the detector.The effect of geometric structure change of collimator on dose rate change after shielding with a certain thickness of shielding material is also simulated. The results show that the collimator will not reduce the scattering effect but increase the scattering contribution with the increase of depth-width ratio when the collimator depth-width ratio is <1.When the depth-width ratio of the collimator is between 1 and 7锛宼he influence of scattering on the measurement results is inhibited rapialy with the increase of depth-width ratio.When the collimator depth-width ratio is >7锛宎ll the scattered 纬-rays can be absorbed by the collimator.It is proved that MCNP is a good method to study 纬-ray scattering.
Key Words
MCNP simulation;纬-ray scattering;Collimator;Shielding
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2.3 璁＄畻缁撴灉涓庢祴閲忓€肩殑姣旇緝
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3 缁撹
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鍙傝€冩枃鐚?/p>
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[3]L.F.Rodriguez et al.evaluation of Gamma-Ray Shielding Calculation and Determination of Shielding Parameters with Bremsstrahlung Radiation[J].Nucl. Sci.Eng.锛?9锛?972锛夛紝349.
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