Influence of the variation of energy spectra with depth in the dosimetry of 192Ir using LiF TLD.
Influence of the variation of energy spectra with depth in the dosimetry of 192Ir using LiF TLD.
复制标题
使用 LiF TLD 进行 192Ir 剂量测定时能谱随深度变化的影响。
DOI：
10.1088/0031-9155/33/10/005
复制
发表时间：
1988
影响因子：
3.5
通讯作者：
Nath,R
中科院分区：
文献类型：
--
作者：
Meigooni,AS;Meli,JA;Nath,R
近距离放射治疗中使用的低活性种子周围的绝对剂量测量难以用电离室进行。腔室的物理尺寸不允许接近种子的良好分辨率，并且产生的电离电流非常低。小型热释光剂量计（TLD）克服了这些问题，但应考虑其响应的能量依赖性。在这项工作中，剂量在聚苯乙烯测量在几个距离的高活性192 Ir源（370 GBq）的远程后装装置使用电离室和LiF的锂离子电池芯片。这些数据表明，在距离源1-10 cm的范围内，LiF的灵敏度变化高达8.5%。这归因于LiF对较低光子能量的较高响应，以及光子光谱随着深度的增加而向较低能量移动。LiF对192 Ir的灵敏度也通过由Monte Carlo计算的光子谱加权LiF的能量依赖响应来计算。计算结果显示，灵敏度随离源距离的变化类似。
Absolute dose measurements around low activity seeds used in brachytherapy are difficult to perform with ionisation chambers. The physical size of the chamber does not allow good resolution close to the seeds and the ionisation current generated is very low. Small thermoluminescent dosimeters (TLDs) overcome these problems but the energy dependence of their response should be considered. In this work, dose in polystyrene was measured at several distances from the high activity 192 Ir source (370 GBq) of a remote afterloading device using an ionisation chamber and LiF TLD chips. These data show that over a range of 1-10 cm from the source the sensitivity of LiF varies by up to 8.5%. This is attributed to the higher response of LiF to the lower photon energies, and to the shift of the photon spectrum to lower energies with increasing depth. The sensitivity of LiF to 192 Ir was also calculated by weighting the energy-dependent response of LiF by the Monte Carlo calculated photon spectra. The calculations give a similar change in sensitivity with distance from the source.
LiF 粉末对 125I 光子的响应。
DOI：
--
发表时间：
1984
期刊：
Medical Physics (Lancaster)
影响因子：
--
作者：
K. Weaver
通讯作者：
K. Weaver
125I粒子在组织中的三维剂量分布。
影响因子：
3.5
作者：
G. Hartmann;W. Schlegel;H. Scharfenberǵ
通讯作者：
H. Scharfenberǵ
用于中低能核素组织剂量测定的参数的蒙特卡罗推导。
影响因子：
2.6
作者：
R. Dale
通讯作者：
R. Dale