Establishment of radiation qualities for mammography according to the IEC 61267 and TRS 457.
This article presents the technical conditions necessary to establish appropriate radiation qualities for the calibration of the dosemeters used in the mammography detectors in the Laboratório de Ciências Radiológicas (LCR) from the Universidade do Estado do Rio de Janeiro. Tests were conducted to evaluate the homogeneity of the radiation field, scattering, half-value layers and system stability. The calibration method (substitution) is described in this work. A moderate alteration in filtration makes it possible to maintain the half-value layers within the limits recommended. The results indicate the adequacy of the LCR laboratory for the calibration of the dosemeters in the radiation qualities for mammography with an expanded uncertainty in the best measurement capability of ± 1.8 % (k = 2).
Laboratório de Ciências Radiológicas da Universidade do Estado do RJ, Rio de Janeiro, Brazil. ejpires@lcr.uerj.br
Evandro J
EJ
Pires
Mariano G
MG
David
J Guilherme
JG
Peixoto
Carlos E
CE
Dealmeida
D002138:Calibration / Q000592:standards*; D005260:Female; D006801:Humans; D008327:Mammography / Q000295:instrumentation* / Q000379:methods; D011829:Radiation Dosage; D011874:Radiometry / Q000379:methods*; D012015:Reference Standards; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity