Characterisation of RPL and TL dosimetry systems and comparison in medical dosimetry applications

Radiophotoluminescence (RPL) dosimetry systems are under permanent development. The following dosimetric characteristics of the GD-352M RPL glass dosimeter with FGD-1000 reader (Dose Ace system) developed for medical applications were investigated: uniformity/batch homogeneity, reproducibility, linearity, detection threshold, energy dependence in air and on phantom. Some characteristics were compared to two kinds of LiF; Cu,Mg,P TLDs: GR-200A (China) and TLD-100H (Harshaw). The characteristics investigated fulfil the requirements of the IEC 62387-1:2007 Standard for personal and environmental dosimetry (IEC, 2007).These dosimetry systems were applied in paediatric chest X-ray diagnostics on 60 patients. The dosimetry results with both dosimetry systems showed a good correlation of dose measured on the back of the patient with the body mass index (BMI) on examination by two technicians (average dose 0.12–0.19 mSv). Higher doses (0.33–0.39 mSv) were found on the patients examined by the third technician. Measurements on further 40 patients following additional consulting and education of the techniciams showed dose reduction (0.13–0.18 mSv for all 3 technicians).