Implementação de Grandezas Operacionais na Monitoração Individual e de Área / Implementation of new operational quantities in the Individual and area monitoring

AUTOR(ES)

Carla da Costa Guimarães

DATA DE PUBLICAÇÃO

2000

RESUMO

Operational quantities have been implemented to be applied in individual and area routine monitoring against external radiation exposure. This procedure is based on the use of an ideal combination of thermoluminescent detectors inside a monitor: two pellets of CaF2, one covered by a lead filter of (0,50 ± 0,05) mm and another one without filter and one TLD-100 without filter too. The operational quantities studied for area monitoring are the ambient and directional dose equivalent, H*(10) and H(10,), respectively and for individual monitoring, the personal dose equivalent, Hp(10). To evaluate the personal dose equivalent, all the experiments were performed irradiating the monitor on a slab water phantom made of PMMA walls with outer dimensions 30x30x15 cm, (a substitute of ICRU sphere four-element tissue phantom) completely full of water. Area monitors were irradiated in free air without any phantom. In general, an operational quantity H is determined from the basic physical quantity kerma free-in-air by means of conversion coefficients. The blind performance testing of monitors was performed after type testing, including analysis of the linearity of the response with the dose, the angular and energy dependence. The results of these investigations agree with the values recommended by international organisations within 95 % of confidence level. The ratios (H(10)evaluated/H(10)nominal ± deviation) obtained for ambient and personal dose equivalente are respectively (1,02 ± 0,11) and (0,97 ± 0,25), with the monitor above quoted. The error was estimated with the method of t-student, considering 95 % confidence level.

ASSUNTO(S)

grandezas operacionais operational quantities area monitoring monitoração de área individual monitoring thermoluminescence termoluminescência monitoração individual dosimetria dosimetry

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