Abstract Americium-241 isotope is used frequently for investigations of luminescent detectors and materials as a source of alpha particles, but it emits also gamma-rays (59.4 keV), what may have influence on the measured signal. The goal of the present work was to perform systematic investigations of the impact of the emitted photons on the measured TL/OSL response for a wide range of various luminescent materials. The obtained results confirmed the importance of this issue for part of the compounds. The contribution of photons to the total luminescent signal was found to range from a negligible level (BeO and LiF:Mg,Ti) up to 15% (e.g. LuAG, Lu2O3). Most of the measured values roughly follow a simple trend line, when plotted versus (μ/ρ)enρh. Some materials however, like LiF:Mg,Cu,P and Al2O3:C, do not fit into that trend, which may be explained by the dependence of their relative luminescent efficiency on ionization density. The effect of 241Am gamma-rays is of particular importance when samples of more complex, layered structure are investigated. For some samples of epitaxial crystalline layers grown on single crystal substrates, it was found that nearly entire (up to 96%) signal was generated by photons, not alpha particles.

中文翻译：

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研究 Am-241 光子对发光材料测量的 α 粒子响应的影响

摘要 镅 241 同位素经常用于研究发光探测器和材料作为 α 粒子的来源，但它也会发射伽马射线 (59.4 keV)，这可能会对测量信号产生影响。目前工作的目标是对发射光子对各种不同发光材料的测量 TL/OSL 响应的影响进行系统研究。得到的结果证实了这个问题对于部分化合物的重要性。发现光子对总发光信号的贡献范围从可忽略不计的水平（BeO 和 LiF:Mg,Ti）到高达 15%（例如 LuAG、Lu2O3）。当绘制与 (μ/ρ)enρh 的关系时，大多数测量值大致遵循一条简单的趋势线。然而，有些材料，如 LiF:Mg、Cu、P 和 Al2O3:C，不符合这种趋势，这可以通过它们的相对发光效率对电离密度的依赖性来解释。当研究更复杂的分层结构样品时，241Am 伽马射线的影响尤为重要。对于在单晶衬底上生长的一些外延晶体层样品，发现几乎全部（高达 96%）的信号是由光子而不是 α 粒子产生的。