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Application of phototransferred thermoluminescence (PTTL) for dose re-assessment in routine dosimetry using MTS-N (LiF:Mg,Ti) thermoluminescent detectors

机译:使用MTS-N(LiF:Mg,Ti)热发光探测器在常规剂量测定中使用光传输热致发光(PTTL)进行剂量重新评估的应用

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摘要

Erasure of the thermoluminescence (TL) signal on detector readout is considered to be a disadvantage of TL dosimetry, as post-readout dose reassessment is then impossible in principle. A method of dose reassessment based on phototransferred thermoluminescence (PTTL) has been developed at the Institute of Nuclear Physics, Polish Academy of Sciences (IFJ PAN) and applied to MTS-N (LiF:Mg,Ti) detectors. We demonstrate the possibility of applying PTTL for dose reassessment in MTS-N TL detectors routinely applied in the dosimetric service at IFJ PAN. Readings of TL detectors exposed to relatively high doses by the customers of our dosimetry service can now be reassessed using our automatic readers. A major obstacle in applying the PTTL method at lower exposures is the presence of residual dose accumulated in LiF:Mg,Ti detectors after many field exposure and readout cycles. Since most of the TL detectors in our service have been already used for a long time (e.g. for over 10 years in the case of some detector batches), we find that our PTTL method of dose reassessment is possible only in detectors which had received doses exceeding 5 mSv. (C) 2014 Elsevier Ltd. All rights reserved.
机译:检测器读数上消除热发光(TL)信号被认为是TL剂量测定法的缺点,因为从原理上讲不可能进行读数后剂量的重新评估。波兰科学院核物理研究所(IFJ PAN)已开发出一种基于光转移热致发光(PTTL)的剂量重新评估方法,并将其应用于MTS-N(LiF:Mg,Ti)检测器。我们证明了在IFJ PAN剂量学服务中常规使用的MTS-N TL检测器中应用PTTL进行剂量重新评估的可能性。现在,可以使用我们的自动读取器来重新评估剂量测定服务的客户暴露于相对较高剂量的TL检测器的读数。在较低的曝光量下应用PTTL方法的主要障碍是在许多场曝光和读出循环后,LiF:Mg,Ti检测器中会积累残留剂量。由于我们服务中的大多数TL检测器已经使用了很长时间(例如,对于某些批次的检测器已经使用了10年以上),因此我们发现,仅在已接收剂量的检测器中,我们的PTTL剂量重新评估方法才有可能超过5毫西弗。 (C)2014 Elsevier Ltd.保留所有权利。

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