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首页> 美国卫生研究院文献>Radiation Protection Dosimetry >Thermoluminescence solid-state nanodosimetry—the peak 5A/5 dosemeter
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Thermoluminescence solid-state nanodosimetry—the peak 5A/5 dosemeter

机译：热发光固态纳米剂量测定法—峰值5A / 5剂量计

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摘要

The shape of composite peak 5 in the glow curve of LiF:Mg,Ti (TLD-100) following 90Sr/90Y beta irradiation, previously demonstrated to be dependent on the cooling rate used in the 400°C pre-irradiation anneal, is shown to be dependent on ionisation density in both naturally cooled and slow-cooled samples. Following heavy-charged particle high-ionisation density (HID) irradiation, the temperature of composite peak 5 decreases by ∼5°C and the peak becomes broader. This behaviour is attributed to an increase in the relative intensity of peak 5a (a low-temperature satellite of peak 5). The relative intensity of peak 5a is estimated using a computerised glow curve deconvolution code based on first-order kinetics. The analysis uses kinetic parameters for peaks 4 and 5 determined from ancillary measurements resulting in nearly ‘single-glow peak’ curves for both the peaks. In the slow-cooled samples, owing to the increased relative intensity of peak 5a compared with the naturally cooled samples, the precision of the measurement of the 5a/5 intensity ratio is found to be ∼15 % (1 SD) compared with ∼25 % for the naturally cooled samples. The ratio of peak 5a/5 in the slow-cooled samples is found to increase systematically and gradually through a variety of radiation fields from a minimum value of 0.13±0.02 for 90Sr/90Y low-ionisation density irradiations to a maximum value of ∼0.8 for 20 MeV Cu and I ion HID irradiations. Irradiation by low-energy electrons of energy 0.1–1.5 keV results in values between 1.27 and 0.95, respectively. The increasing values of the ratio of peak 5a/5 with increasing ionisation density demonstrate the viability of the concept of the peak 5a/5 nanodosemeter and its potential in the measurement of average ionisation density in a ‘nanoscopic’ mass containing the trapping centre/luminescent centre spatially correlated molecule giving rise to composite peak 5.
机译：LiF：Mg，Ti（TLD-100）在 90 Sr / 90 Yβ辐照后的辉光曲线中的复合峰5的形状，以前证明依赖于结果表明，在400°C的预辐射退火中使用的冷却速率取决于自然冷却和慢冷样品中的电离密度。在重电荷粒子高电离密度（HID）辐照之后，复合峰5的温度降低了〜5°C，峰变得更宽。此行为归因于峰5a（峰5的低温卫星）的相对强度增加。使用基于一阶动力学的计算机化辉光曲线反卷积码估算峰5a的相对强度。该分析使用了通过辅助测量确定的峰4和5的动力学参数，从而导致两个峰的曲线几乎都是“单辉峰”。在慢冷样品中，由于峰5a的相对强度与自然冷却的样品相比有所增加，因此5a / 5强度比的测量精度为〜15％（1 SD），而〜25为％为自然冷却的样品。发现 90 Sr / 90 <>时，缓慢冷却样品中5a / 5峰的比率通过各种辐射场从0.13±0.02的最小值逐渐系统地增加。 / sup> 20 MeV Cu和I离子HID辐照的Y低电离密度辐照达到约0.8的最大值。低能量电子辐照的能量为0.1-1.5 keV，其值分别在1.27和0.95之间。随着电离密度的增加，峰5a / 5的比值的增加值证明了峰5a / 5纳米剂量计的概念的可行性以及其在包含捕获中心/发光的“纳米”质量中测量平均电离密度的潜力。中心空间相关的分子产生复合峰5。

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