Kramer G H, Yiu S
Radiation Protection Bureau, Ottawa, Ontario, Canada.
Health Phys. 1997 Mar;72(3):465-70. doi: 10.1097/00004032-199703000-00015.
This paper theoretically investigates how the counting efficiencies of three selected detector (NaI) sizes are affected by neck-detector distance, detector misplacement, thickness of overlaying tissue, and size of the thyroid gland. The detector sizes were small, 2.54 cm diameter and 0.2 cm crystal thickness; medium, 7.62 cm diameter and 0.2 cm crystal thickness; large 30.48 cm diameter and 0.2 cm crystal thickness. The evaluations were determined using a Monte Carlo technique. The simulations show that the large detector minimizes the uncertainties for all problems except the thickness of overlaying tissue.
本文从理论上研究了三种选定尺寸的探测器（碘化钠）的计数效率如何受到颈部与探测器距离、探测器位置偏移、覆盖组织厚度以及甲状腺大小的影响。探测器尺寸分别为小尺寸，直径2.54厘米，晶体厚度0.2厘米；中尺寸，直径7.62厘米，晶体厚度0.2厘米；大尺寸，直径30.48厘米，晶体厚度0.2厘米。评估采用蒙特卡罗技术进行。模拟结果表明，除覆盖组织厚度外，大尺寸探测器能将所有问题的不确定性降至最低。
