Comparison of air kerma measurements between the PTB and the IAEA for x-radiation qualities used in general diagnostic radiology and mammography

Abstract

A comparison of the air kerma standards for x-radiation qualities used in general diagnostic radiology and mammography, identified as EURAMET.RI(I)-S10 (EURAMET project #1221), was performed between the PTB and the IAEA. Two spherical and two parallel-plate reference-class ionization chambers of the IAEA and 12 beam qualities standardized in the IEC standard 61267:2005 plus additional 7 standard beam qualities established at both laboratories were selected for the comparison. The calibration coefficients were determined for the transfer chambers at the PTB in September 2012 and before and after this at the IAEA Dosimetry Laboratory. The results show the calibration coefficients of both laboratories to be in good agreement within the standard uncertainty of the comparison of about 0.47 %.

Energy dependent response of plastic scintillation detectors to photon radiation of low to medium energy

“…Uncertainty of the air kerma rate determination with the PK100 was 0.3%, uncertainty on monitor normalization was 0.1%, and uncertainty on beam nonuniformity was 0.1%. 36 Uncertainty of the calibration in terms of D w was 1.1%, 0.9%, 0.8%, 0.7%, 0.7%, and 0.6% for T70, T100, T150, T200, T250, and T 280, respectively. 37 Reproducibility of measurements at the 90 Sr source has been estimated to be 0.6%, and this uncertainty has been assigned to current measurements at the 90 Sr source.…”

Comparison of air kerma area product and air kerma meter calibrations for X-ray radiation qualities used in diagnostic radiology

“…It is expressed as the difference of the companion result and the respective CRV. When a number of radiation qualities and instruments are used in a comparison, the results are deduced for each quality and instrument, separately [2,3,4,17,20], as described in the previous sections.…”

“…Twenty two (22) laboratories (PSDLs and SSDLs) participated in this EURAMET #1177 comparison (Table 1) The ICRL/GAEC-EIM, Greece (EL) as the pilot laboratory was responsible for the overall coordination of the comparison and the analysis and the reporting of the results.…”

“…BIPM.RI(I)-K2 and BIPM.RI(I)-K3, between MKEH and BIPM at low and medium CCRI therapy radiation qualities [18,19,20,21]. According to the BIPM and EURAMET database, only the EURAMET RI(I)-S10 has been reported, which is a bilateral supplementarysupporting comparison between IAEA and PTB [17,22], as well as the EURAMET 536 project which concerned mammography radiation qualities [2].  The transfer KAP meters used in this comparison were commercial instruments that read directly the P KA and they could not measure electric current; so any correlation of the measurement components between participating laboratories and PSDL or BIPM were not feasible.…”

“…Five PSDLs have published results in the data base BIPM.RI(I)-K7. The EURAMET project #1221 (2012) identified as EURAMET.RI(I)-S10, referred to the PTB and IAEA bilateral comparison of the air kerma standards for x-radiation qualities used in general diagnostic radiology and mammography [3]. The BIPM.RI(I)-S1 (2012) supplementary comparison concerned the comparison of the air-kerma standards of the IAEA and the BIPM in the mammography x-ray range from 25 kV to 35 kV [4].…”