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首页> 外文期刊>Medical Physics >Energy spectrum based calculation of the half and the tenth value layers for brachytherapy sources using a semiempirical parametrized mass attenuation coefficient formulism.
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Energy spectrum based calculation of the half and the tenth value layers for brachytherapy sources using a semiempirical parametrized mass attenuation coefficient formulism.

机译：使用半经验参数化质量衰减系数公式，基于能量谱对近距离放射治疗源的一半和第十值层进行计算。

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摘要

As different types of radionuclides (e.g., 131Cs source) are introduced for clinical use in brachytherapy, the question is raised regarding whether a relatively simple method exists for the derivation of values of the half value layer (HVL) or the tenth value layer (TVL). For the radionuclide that has been clinically used for years, such as 125I and 103Pd, the sources have been manufactured and marketed by several vendors with different designs and structures. Because of the nature of emission of low energy photons for these radionuclides, energy spectra of the sources are very dependent on their individual designs. Though values of the HVL or the TVL in certain commonly used shielding materials are relatively small for these low energy photon emitting sources, the question remains how the variations in energy spectra affect the HVL (or TVL) values and whether these values can be calculated with a relatively simple method. A more fundamental question is whether a method can be established to derive theHVL (TVL) values for any brachytherapy sources and for different materials in a relatively straightforward fashion. This study was undertaken to answer these questions. Based on energy spectra, a well established semiempirical mass attenuation coefficient computing scheme was utilized to derive the HVL (TVL) values of different materials for different types of brachytherapy sources. The method presented in this study may be useful to estimate HVL (TVL) values of different materials for brachytherapy sources of different designs and containing different radionuclides.
机译：随着不同类型的放射性核素（例如131Cs来源）被引入临床用于近距离放射治疗，提出了一个问题，即存在一种相对简单的方法来推导半值层（HVL）或第十值层（TVL）的值）。对于临床上已使用多年的放射性核素（例如125I和103Pd），放射源已由多家设计和结构不同的供应商制造和销售。由于这些放射性核素会发出低能光子，因此这些源的能谱非常依赖于它们的个性化设计。尽管对于这些低能光子发射源，某些常用屏蔽材料中的HVL或TVL值相对较小，但问题仍然在于，能谱的变化如何影响HVL（或TVL）值以及是否可以使用以下方法计算这些值：一种相对简单的方法。一个更基本的问题是，是否可以建立一种方法以相对简单的方式得出任何近距离放射治疗源和不同材料的HVL（TVL）值。进行这项研究是为了回答这些问题。基于能谱，一种完善的半经验质量衰减系数计算方案被用于得出不同类型的近距离放射治疗源的不同材料的HVL（TVL）值。在这项研究中提出的方法可能有助于估计不同设计和含有不同放射性核素的近距离放射治疗源的不同材料的HVL（TVL）值。

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