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首页> 外文学位 >Evaluation of bremsstrahlung X-rays when beta radiation from beta-forbidden transitions is stopped in thick targets.
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Evaluation of bremsstrahlung X-rays when beta radiation from beta-forbidden transitions is stopped in thick targets.

机译：厚靶标中停止有β禁止跃迁的β辐射时评估致X射线。

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摘要

In this study, algebraic expressions obtained by folding together beta radiation energy distributions for selected forbidden transitions with an algebraic representation of the bremsstrahlung distribution from monoenergetic electrons have been derived and used to obtain bremsstrahlung energy distributions when beta radiation is stopped in a thick attenuator. Results are compared with results from Monte Carlo simulations using the code Electron Gamma Shower (EGSnrc). There are some differences between the results, but the simulations with EGSnrc agree quite well with the algebraic calculations for the bremsstrahlung energy distributions from the first and second forbidden beta transition within an acceptable range of uncertainty. Also the algebraic calculations for a representative beta spectrum are compared with the beta spectral data from ICRU 56, Dosimetry of External Beta Rays for Radiation Protection, and the algebraic calculations for the bremsstrahlung energy distribution are compared with the data from bremsstrahlung spectra from electrons from the “Atomic Data and Nuclear Data Tables 35”. There is acceptable agreement in both of the comparison results.
机译：在这项研究中，通过将β辐射能分布与选定的禁忌跃迁折叠在一起的代数表达式与单能电子中的ms致辐射分布的代数表示，已经得到了代数表达式，并将其用于在厚衰减器中停止β辐射时获得致辐射能分布。将结果与使用代码电子伽玛淋浴（EGSnrc）的蒙特卡洛模拟的结果进行比较。结果之间存在一些差异，但是使用EGSnrc进行的模拟与在可接受的不确定性范围内从第一个和第二个禁止的β跃迁进行的ms致辐射能量分布的代数计算非常吻合。还将代表性β光谱的代数计算与来自ICRU 56的Beta光谱数据进行比较，以进行辐射防护的外部Beta射线剂量测定，并将the致辐射能分布的代数计算与来自the致电子的致辐射光谱的数据进行比较“原子数据和核数据表35”。两种比较结果都可以接受。

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