Journal of Medical Physics
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Year : 2022  |  Volume : 47  |  Issue : 1  |  Page : 34-39

Calculation of attenuation parameter for Ir-192 gamma source in shielding materials

1 School of Medical Imaging, Faculty of Health Sciences, Universiti Sultan Zainal Abidin, Terengganu, Malaysia
2 Oncological and Radiological Science Cluster, Advanced Medical and Dental Institute, Universiti Sains Malaysia, Penang, Malaysia
3 Department of Physics and Engineering Physics, Obafemi Awolowo University, Ile-Ife, Nigeria

Correspondence Address:
Dr. Adila Hanim Aminordin Sabri
Faculty of Health Sciences, Universiti Sultan Zainal Abidin, Terengganu
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/jmp.jmp_86_21

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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.

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