Ginjaume M, Pérez S, Ortega X, Duch M A
Institute of Energy Technology (INTE), Technical University of Catalonia (UPC), Diagonal 647, 08028 Barcelona, Spain.
Radiat Prot Dosimetry. 2006;120(1-4):316-20. doi: 10.1093/rpd/nci586. Epub 2006 Apr 27.
Two types of thin LiF:Mg,Cu,P detectors, GR-200F and MCP-Ns, have been characterised for use in the design of an extremity dosemeter for mixed beta-photon radiation fields. Both detectors consist of an extremely thin layer of sensitive material with effective thicknesses of 5 and 8 mg cm(-2), respectively, held in a 5 mg cm(-2) PVC ring holder. Dosimetric performance was analysed according to the ISO 12794 standard and compared with 240 mg cm(-2) TLD-100 measurements. In particular, the energy response was obtained for ISO narrow X-ray spectra, (137)Cs, (60)Co, (204)Tl and (90)Sr/(90)Y. From these measurements a mean calibration factor was calculated to estimate H(p)(0.07). Subsequently, the performance of the dosemeters was checked for a set of 10 different mixed photon and beta-photon fields. The study shows that the proposed dosemeters can estimate H(p)(0.07) in a wide range of mixed beta-photon fields with a maximum deviation from the given dose of 30% and an overall uncertainty of the order of 25% (k = 1). However, the results also highlight a large variability among the different thin detectors and, thus, the standard TLD-100 material is recommended whenever the workplace does not include low-energy beta radiation.
已对两种类型的薄型LiF:Mg,Cu,P探测器（GR - 200F和MCP - Ns）进行了特性表征，以用于设计混合β - 光子辐射场的四肢剂量计。两种探测器均由极薄的敏感材料层组成，有效厚度分别为5和8 mg cm⁻²，置于5 mg cm⁻²的PVC环形支架中。根据ISO 12794标准分析了剂量学性能，并与240 mg cm⁻²的TLD - 100测量结果进行了比较。特别是，获得了ISO窄X射线光谱、¹³⁷Cs、⁶⁰Co、²⁰⁴Tl和⁹⁰Sr/⁹⁰Y的能量响应。通过这些测量计算出平均校准因子以估计H(p)(0.07)。随后，针对一组10种不同的混合光子和β - 光子场检查了剂量计的性能。研究表明，所提出的剂量计能够在广泛的混合β - 光子场中估计H(p)(0.07)，与给定剂量的最大偏差为30%，总体不确定度约为25%（k = 1）。然而，结果也突出了不同薄探测器之间的较大变异性，因此，只要工作场所不包含低能β辐射，建议使用标准的TLD - 100材料。
