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Calculation of photon scattering and transmission correction factors for a free air ionization chamber at Nuclear Science and Technology Research Institute in Iran

机译:伊朗核科学技术研究所的自由空气电离室的光子散射和传输校正因子的计算

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In primary standard dosimetry laboratories, the air kerma strength of low energy brachytherapy sources (125)~I and (103)~Pd is measured by standard free air ionization chambers. At present, one of these free air ionization chambers is constructed in Radiation Application Research School, in Nuclear Science and Technology Research Institute in Iran. The transmission and scattering correction factors are needed for the absolute determination of air kerma strength. Transmission and scattering correction factors were calculated for a monoenergetic point isotropic source with energies from 5 keV to 100 keV for ionization chamber with 4 cm and 6 cm aperture radii by using the MCNP 4C code. The calculated scattering correction factors for (125)~I and (103)~Pd brachytherapy sources are 0.9987 and 0.9992, respectively and determined transmission correction is one for our free air ionization chamber of aperture radius 4 cm.
机译:在主要的标准剂量实验室中,低能量近距离放射治疗源(125)〜I和(103)〜Pd的空气比释动能强度是通过标准的自由空气电离室测量的。目前,这些自由空气电离室之一是在伊朗核科学技术研究所的辐射应用研究所建造的。绝对确定空气比释动能强度需要透射和散射校正因子。通过使用MCNP 4C编码,针对半径为4 cm和6 cm的电离室,计算了能量为5 keV至100 keV的单能点各向同性源的透射和散射校正因子。对于(125)〜I和(103)〜Pd近距离放射治疗源,计算得出的散射校正因子分别为0.9987和0.9992,对于我们的孔径为4 cm的自由空气电离室,确定的透射校正为1。

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