热释光剂量片γ射线响应的线性上限和重复性研究

Linear Upper Limit and Repeatability of Thermoluminescence Dosimeters in γ-ray

摘要: 本文利用 60 Co试验研究了国产LiF(Mg,Ti)-M热释光剂量片（TLD）对γ射线的线性响应上限及其重复性。结果表明，国产LiF(Mg,Ti)-M的线性响应上限在150～200 Gy之间，超过线性上限后灵敏度下降，退火后再次使用灵敏度增加。试验结果还表明，即使接受到的吸收剂量在非线性区域，1组剂量片的响应一致性仍可在后续多次使用中保持。据此，本文提出采用成批使用的方法测量非线性区域的吸收剂量，这可提高大吸收剂量测量的准确性。

Abstract: The linear upper limit and repeatability of thermoluminescence dosimeter (TLD) LiF(Mg,Ti)-M produced in China was studied by using 60 Co. The results indicate that the linear upper limit of the LiF(Mg,Ti)-M is in 150-200 Gy. Beyond the linear upper limit, the sensitivity decreases，and the sensitivity increases when it was used again after being annealed. The results also indicate that the uniformity of a group of TLDs can remain even if their absorbed dose is beyond the upper limit. Based on this feature, the way of using TLDs in batch mode was proposed to measure the absorbed dose beyond the upper limit, by which the measurement accuracy can be improved.