Adaptation of an individual external monitoring system for gamma and x ray evaluation of the individual dose equivalent "HP(10)", utilizing a photographic dosemetry technique / AdaptaÃÃo de um sistema de monitoraÃÃo individual externa para raios x e gama para avaliaÃÃo do equivalente de dose pessoaL âHp(10)â, utilizando a tÃcnica da dosimetria fotogrÃfica

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

Individual monitoring evaluates external souces of ionizing radiation X, γ, β and n, to which workers are occupationally exposed, for ensuring safe and acceptable radiological conditions in their places of employment. The dose received by workers should attend the limits authorized by national regulatory organs. Nowadays, there are two radiometric unit systems, based on resolutions of the Nacional Nuclear Energy Commission (NNEC) and the International Commission on Radiation Units and Measurements (ICRU); in the conventional (NNEC) system, the doses received by workers are evaluated through the individual dose Hx, where dosemeters used on surface of thorax are calibrated in terms of air kerma; in the recent system (ICRU), the doses are evaluated through the individual dose equivalent HP(d), where dosemeters are calibrated in terms of dose from phantom. The recent system improves the method of evaluation, by taking into account the scattering effect and absorption of radiation in the human body. This work adapts a photographic dosemetry service to the recent ICRU publications, for evaluation of individual monitoring, in function of the individual dose equivalent HP(10) of strong penetrating radiation. For this, a methodology based on linear programming and determination of calibration curves is used for radiation capacities, wide (W) and narrow (N) spectra, as described by the International Organization for Standardization (ISO 4037-1, 1995). These calibration curves offer better accuracy in the determination of doses and energy, which will improve the quality of the service given to society

ASSUNTO(S)

programaÃÃo linear photographic dosemetry monitoraÃÃo individual individual monitoring dosimetria fotogrÃfica engenharia nuclear linear programming

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