Kato K, Antoku S, Sawada S, Russell W J
Department of Clinical Studies, Radiation Effects Research Foundation, Hiroshima, Japan.
Med Phys. 1991 Sep-Oct;18(5):928-33. doi: 10.1118/1.596608.
Characteristics of Mg2SiO4(Tb) thermoluminescent dosimeters (TLD) were ascertained preparatory to measuring doses from diagnostic x-ray examinations received by Adult Health Study participants. These detectors are small, relatively sensitive to low-dose x-rays, and are appropriate for precise dosimetry. Extensive calibration is necessary for precisely determining doses according to their thermoluminescent intensities. Their sensitivities were investigated by dose, according to x-ray tube voltage, and by exposure direction, to obtain directional dependence. Dosimeter sensitivity lessened due to the fading effect and diminution of the planchet. However, these adverse effects can be avoided by storing the dosimeters at least 1.5 h and by using fresh silver-plated planchets. Thus the TLDs, for which sensitivities were determined in this study, will be useful in subsequent diagnostic x-ray dosimetry.
在测量成人健康研究参与者接受的诊断性X射线检查剂量之前，先确定了Mg2SiO4（Tb）热释光剂量计（TLD）的特性。这些探测器体积小，对低剂量X射线相对敏感，适用于精确剂量测定。为了根据热释光强度精确确定剂量，需要进行广泛的校准。根据X射线管电压，通过剂量以及通过照射方向研究了它们的灵敏度，以获得方向依赖性。由于褪色效应和托盘的减少，剂量计的灵敏度降低。但是，通过将剂量计至少存放1.5小时并使用新鲜的镀银托盘，可以避免这些不利影响。因此，本研究中确定了灵敏度的TLD将在随后的诊断性X射线剂量测定中发挥作用。
