屏蔽材料中铱-192γ源衰减参数的计算
Calculation of Attenuation Parameter for Ir-192 Gamma Source in Shielding Materials.
作者信息
Sabri Adila Hanim Aminordin, Abdul Aziz M Z, Olukotun S F, Tajudin S M
机构信息
School of Medical Imaging, Faculty of Health Sciences, Universiti Sultan Zainal Abidin, Terengganu, Malaysia.
Oncological and Radiological Science Cluster, Advanced Medical and Dental Institute, Universiti Sains Malaysia, Penang, Malaysia.
出版信息
J Med Phys. 2022 Jan-Mar;47(1):34-39. doi: 10.4103/jmp.jmp_86_21. Epub 2022 Mar 31.
PURPOSE
Calculation of photon attenuation is necessary for the selection of shielding materials for an irradiation facility.
METHODS AND MATERIALS
In this work, a Monte Carlo simulation was utilized to assess the effectiveness of clay-polyethylene mixture and clay as the radiation shielding materials for high-energy gamma sources (Ir-192). Ordinary concrete was also studied as the benchmark.
RESULTS
The calculated linear attenuation values for ordinary concrete are within 0.44% of the standard XCOM value for 380 keV photon. In the case of a multienergy Ir-192 gamma source, the calculated linear attenuation coefficient (μ) for ordinary concrete is 15.5% and 7.25% higher than clay and fabricated clay-polyethylene, respectively. Meanwhile, the μ value for fabricated clay-polyethylene is 8.3% higher than that of clay.
CONCLUSION
In conclusion, a 10 cm thickness of clay and clay-polyethylene mixture is sufficient to attenuate 87% and 89% of photons from Ir-192 source. The calculated linear attenuation coefficients for the three shielding materials are also consistently higher, about 7.5%, than that of the XCOM value for 380 keV photon.
目的
计算光子衰减对于为辐照设施选择屏蔽材料是必要的。
方法和材料
在本研究中，利用蒙特卡罗模拟评估粘土 - 聚乙烯混合物和粘土作为高能伽马源（铱 - 192）辐射屏蔽材料的有效性。普通混凝土也作为基准进行了研究。
结果
计算得出的普通混凝土的线性衰减值在380 keV光子的标准XCOM值的0.44%以内。对于多能铱 - 192伽马源，计算得出的普通混凝土的线性衰减系数（μ）分别比粘土和制成的粘土 - 聚乙烯高15.5%和7.25%。同时，制成的粘土 - 聚乙烯的μ值比粘土高8.3%。
结论
总之，10厘米厚的粘土和粘土 - 聚乙烯混合物足以衰减来自铱 - 192源87%和89%的光子。三种屏蔽材料计算得出的线性衰减系数也始终比380 keV光子的XCOM值高约7.5%。
Zotero 插件