Al-Haj Abdalla, Lagarde Charlie, Mahyoub Fareed
Biomedical Physics Department, MBC 03, King Faisal Specialist Hospital & Research Centre, PO Box 3354, Riyadh 11211, Saudi Arabia.
Radiat Prot Dosimetry. 2007;125(1-4):399-402. doi: 10.1093/rpd/ncl565. Epub 2007 Jan 12.
It is well known that spurious signals can occur in thermoluminescence dosimetry (TLD) whenever contaminants (i.e. dirt, oil, dust) are present on the surface of the TLD card or crystal during the read-out process. For TLD cards, the Teflon material can also contribute to the background noise and this contribution has been found to depend on the material's light absorption. These non-radiation-induced signals contribute to the total light output during TLD read-out and can lead to incorrect dosimetry especially for low-dose measurements such as personal dosimetry. However, these spurious signals are generally in the low-temperature channels and are mostly accompanied by abnormal glow curves. Most of the published reports dealing with this type of spurious TL signal are on the LiF:Mg,Ti (TLD-100) material. The relatively new TLD material, LiF:Mg,Cu,P, is more sensitive and has higher signal-to-noise ratio than the traditional LiF:Mg,Ti. In this study, the effects of disturbing signals to the LiF:Mg,Cu,P (TLD-100H) cards used in personal dosimetry are investigated and compared with those of LiF:Mg,Ti (TLD-100).
众所周知，在热释光剂量测定法（TLD）中，每当在读出过程中热释光剂量卡或晶体表面存在污染物（即污垢、油污、灰尘）时，就会出现虚假信号。对于热释光剂量卡，聚四氟乙烯材料也会对背景噪声产生影响，并且已发现这种影响取决于该材料的光吸收。这些非辐射诱导信号会对热释光剂量读出过程中的总光输出产生影响，并可能导致剂量测定错误，尤其是对于个人剂量测定等低剂量测量。然而，这些虚假信号通常出现在低温通道中，并且大多伴随着异常的发光曲线。大多数已发表的关于这类虚假热释光信号的报告都针对LiF:Mg,Ti（TLD - 100）材料。相对较新的热释光剂量材料LiF:Mg,Cu,P比传统的LiF:Mg,Ti更灵敏，且具有更高的信噪比。在本研究中，研究了干扰信号对个人剂量测定中使用的LiF:Mg,Cu,P（TLD - 100H）卡的影响，并与LiF:Mg,Ti（TLD - 100）的影响进行了比较。
