A COMPARISON OF CS-137 AND X-RAY SOURCES AS CALIBRATION REFERENCES FOR THERMOLUMINESCENT DOSIMETER CHIPS USED IN THE SASKATCHEWAN POSTAL QUALITY ASSURANCE PROGRAM FOR DIAGNOSTIC RADIOLOGY


41th Annual CNS-CNA Student Conference - 2017 June 05

Presented at:
41th Annual CNS-CNA Student Conference
2017 June 05
Location:
Niagara Falls, ON Canada
Session Title:
Student Posters, Wine-&-Cheese Reception

Authors:
A. Ravichandran (University of Saskatchewan)
J. Sadowski (Radiation Safety Institute of Canada)
  

Abstract

This work is focused on calibrating Thermoluminescent Dosimeters (TLDs) using Cs-137 instead of using x-ray. TLD chips which are used in the Saskatchewan Ministry of Labour Postal Quality Assurance (PQA) program were irradiated using X-Ray machine and an AEA Model 773 Cs-137 Instrument Calibrator at known exposure levels. The response was measured to be 0.1275 ± 0.0049 nC per mR for x-ray exposures and 0.0772 ± 0.0028 nC per mR for the Cs-137 exposures. Neither kVp or beam filtration appeared to have any effect on the chip response. These results show that application of an appropriate correction factor k = 0.6056 ± 0.0057 will allow chips to be calibrated using Cs-137.

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