The use of LiF (TLD-100) as an out-of-field dosimeter.
The use of LiF (TLD-100) as an out-of-field dosimeter.
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DOI：
10.1120/jacmp.v8i4.2679
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发表时间：
2007-09-24
影响因子：
2.1
通讯作者：
Salehpour M
中科院分区：
文献类型：
--
作者：
Kry SF;Price M;Followill D;Mourtada F;Salehpour M
常用的热释光剂量计100（Harshaw Chemical Company，Solon，OH）不仅对光子和电子有反应，而且对高能治疗过程中产生的中子也有反应。因此，当使用高能辐射时，治疗野外的100个测量值是可疑的。虽然替代品，如100 - 700不响应中子，这种专业剂量计是昂贵的，并没有在大多数诊所常规使用。在当前研究中，我们检查了100在测量作为治疗能量函数的场外光子剂量时的准确性。为了确定与<$-700相比<$-100的准确性，在治疗野外通过以6、10、15和18 MV运行的医用加速器对<$-100进行辐照。为了消除100对中子的反应，在18 MV的辐照之前，将100胶囊包裹在不同厚度的镉箔（0.25 - 0.75 mm）中。发现场外E100在6 MV和10 MV时准确，但在15 MV和18 MV时反应过度（相对于E100高达1063%）。通过在高达0.75 mm的镉中包裹<$-100，可以大幅降低（平均降低39%）<$-100的过度响应;然而，完全消除过度响应是不可能的。虽然E100非常适合测量能量高达10 MV的场外剂量，但在更高的能量（15 MV或更高）下，该剂量计会显著过度响应，不应使用。尽管将放射性物质包裹在镉中在一定程度上减少了过度反应，但这种减少不足以使放射性物质100在高治疗能量下测量场外剂量。PACS编号：87.52. -g、87.53. -j、87.53. -Dq
The commonly used thermoluminescent dosimeter TLD‐100 (Harshaw Chemical Company, Solon, OH) responds not only to photons and electrons, but also to neutrons that are produced during high‐energy therapies. As a result, TLD‐100 measurements outside of the treatment field are suspect when high‐energy radiation is used. Although alternatives such as TLD‐700 do not respond to neutrons, specialty dosimeters of this kind are expensive and are not routinely used in most clinics. In the current study, we examined the accuracy of TLD‐100 in measuring the out‐of‐field photon dose as a function of treatment energy. To determine the accuracy of TLD‐100 as compared with TLD‐700, TLD‐100 was irradiated outside of the treatment field by medical accelerators operated at 6, 10, 15, and 18 MV. In an effort to eliminate the response of TLD‐100 to neutrons, TLD capsules were encased in varying thicknesses of cadmium foil (0.25 – 0.75 mm) before being irradiated at 18 MV. The out‐of‐field TLD‐100 was found to be accurate at 6 MV and 10 MV, but to be substantially over‐responsive at 15 MV and 18 MV (by up to 1063% relative to TLD‐700). By wrapping the TLD‐100 in up to 0.75 mm of cadmium, it was possible to drastically reduce (down to 39% on average) the over‐response of the TLD‐100; however, total removal of the over‐responsiveness was not possible. Although TLD‐100 is well suited for measuring out‐of‐field dose at energies as high as 10 MV, at higher energies (15 MV or greater), this dosimeter over‐responds substantially and should not be used. Although encasing the TLD in cadmium minimized over‐response to a degree, the reduction was not sufficient to make TLD‐100 viable for measuring out‐of‐field dose at high treatment energies. PACS numbers: 87.52.‐g, 87.53.‐j, 87.53.‐Dq
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影响因子：
1
作者：
Liu, HM;Hsu, PC;Liaw, TF
通讯作者：
Liaw, TF
DOI：
10.1016/j.ijrobp.2004.12.091
发表时间：
2005-07-15
影响因子：
7
作者：
Kry, SF;Salehpour, M;Rosen, II
通讯作者：
Rosen, II
影响因子：
3.8
作者：
Howell, RM;Hertel, NE;Fullerton, GD
通讯作者：
Fullerton, GD
影响因子：
3.5
作者：
BUSUOLI, G;CAVALLINI, A;RIMONDI, O
通讯作者：
RIMONDI, O
影响因子：
3.8
作者：
MCGINLEY, PH
通讯作者：
MCGINLEY, PH