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Blind performance testing of personal and environmental dosimeters based on TLD-100 and natural CaF2:NaCl

2003; Elsevier BV; Volume: 37; Issue: 2 Linguagem: Inglês

10.1016/s1350-4487(02)00172-5

1879-0925

Cristiane Carvalho Guimarães, Emico Okuno,

Graphite, nuclear technology, radiation studies

Blind performance testing was performed to evaluate the personal Hp(10), ambient H∗(10) and directional H′(10,α) operational quantities for penetrating radiation using dosimeters containing two TLD-100 and two natural CaF2:NaCl thermoluminescent (TL) detectors, one of each type placed between a lead filter. Initially, the curve of the TL response dependence with the photon energy was obtained for each detector. The monitors were irradiated on a polymethil methacrylate slab water phantom to evaluate Hp(10) and free in air in case of H∗(10) and H′(10,α). The analysis was performed based on the trumpet curves derived from the recommendations of ICRP (1990 Recommendations of the International Commission on Radiological Protection. ICRP Publication 60, 1991; General Principles for the Radiation Protection of Workers. ICRP Publication 75, 1997). A combination of two CaF2:NaCl detectors (one without and one with lead filter) and one LiF TLD-100 without filter provides values of operational quantities within 95% confidence level as recommended by the international organization. The average ratios 〈H(10)determined/H(10)nominal〉 (deviation) obtained for personal and ambient dose equivalents are 1.00(12) and 1.03(06), respectively, with the combination of three of the detectors above quoted.