Temporal Dependence of the Radiation Monitoring Instruments for Area Monitoring Used at Radiodiagnostic and Intervention Facilities

Abstract

Area monitoring is a fundamental test at radiodiagnostic facilities to maintain an acceptable level of radiation exposure for employees and members of the public. Experimental measurements were taken in an ionising radiation calibration laboratory. Four area monitor instruments were used. Dose and dose rate measurements were measured in integrated and rate operating modes. The results show that precautions are necessary where the area monitor uses exposure times of ≤2 s. When taking measurements in rate mode for times ≤2 s, the area monitors evaluated show a tendency to underestimate dose rate, the inaccuracy was 41 %, and varied between 34 and 45 % for different energies. It is highly recommendable to work in integrated mode, inaccuracy varied from 2 to 35 %. For measurements taken with exposure times of ≥3 s, the average inaccuracy was 15 % and the range was between 2 and 41 %.

Radiometric Survey in Mammography: Review of regulations, recommendations, field and laboratories practices and first tests.

“…This deviation was found comparing this with measures on integrated dose mode, in ISO N 25 beam quality. Leyton et al [17] tested the same equipment in the same laboratory and found results with the same behavior. Differences between measures with dose rate and integrated dose mode, but this time using exposures with ISO N60, N80 and N100, which corresponds to 60, 80 and 100 kV of Tube voltage.…”