Caracterização das qualidades de radioproteção N10 a N150 no laboratório de metrologia do Departamento de Ciências Radiológicas

Abstract

The characterization in the Metrology Laboratory of the Department of Radio-logical Sciences (LABMETRO / DCR / IBRAG / UERJ) of the series of narrow spec-tra, or series N, for the purpose of radiological protection as recommended by the ISO 4037-1:2015 standard, was the object of the present work. Eleven qualities were characterized, N10 to N150. An industrial x-ray tube, a spectrometer and a specific ionization chamber for radioprotection were used to acquire the measurements. For each quality, inherent and fixed filtration, average spectral energy, spectral resoluti-on, half-value layer, kerma in the air and associated uncertainties were calculated for each quality, in addition to the energy dependency curve of the ionization cham-ber. The results obtained were compared with the reference values given by the standard and with national, primary and secondary laboratories available in the lite-rature. All results were satisfactory when compared with the normative reference values, except for the spectral resolution for the N150 quality, which showed a diffe-rence 9% above the recommended. The characterization of the series of narrow spectra in qualities N10 to N150 has been established. In order for LABMETRO / DCR / IBRAG / UERJ to fully offer the calibration service to society, metrological tra-ceability, obtained in a reference laboratory, preferably a national one, is necessary. We emphasize the importance of the qualities now characterized by the fact that they are the basis for the characterization of qualities that allow the calibration of the operational quantities contemplated in the third part of the ISO 4037 standard: cali-bration of area and personnel dosimeters and measurements of their responses as a function of energy and angle of incidence.