Evaluation of Dosimetric Performance and Global Uncertainty of the Harshaw 6600 Plus System Used to Staff Monitoring in Côte d’Ivoire

Abstract

The objective of this work is to check the dosimetric performances of the TLD-100 as stated by the manufacturer as well as the technical standards of radiation protection. The purpose of the performance audit is to assess the inhomogeneity of TLD sensitivity, repeatability and reproducibility, linearity, energy dependence, angular dependence, and fading. All tests were performed under the conditions of ambient temperature and relative humidity recommended by the manufacturer. We began the study by calibrating the Harshaw 6600 Plus, and checking its performance. The TLD-100 performance verification results were all acceptable and in accordance with the manufacturer's advertised values and the radiation protection technical standards. However the performance of the TLD-100 that we have evaluated may have some limitations; these limits, which are sources of uncertainty, have been taken into account in this work by evaluating the overall uncertainty of the Hp (10) dose in the uncertainty range 9.45% to 15.80% by simple formulas. The TLD-100 personal dosimeters and the 6600 Plus reader system indicate that the calculated values of the overall uncertainty Hp (10) are well below the allowable values of 21% to 42% suggested for personal dosimetry services. The obtained data encourage the use of the system for the routine evaluation of the external exposure of workers under ionizing radiation in our laboratory.

Determination of Calibration Factors and Uncertainties Associated with the Irradiation of MTS-N (LiF: Mg, Ti) Chips with Cesium-137 and X-ray Sources Under Low Doses for Personal Dosimetry in Diagnostic Radiology

“…Sabar et al, likewise, reported that there could be very high deviation (above 40%) below 0.3mGy (18). This was also supported by Kouakou et al, who evaluated dosimetric performance and uncertainty for TLD-100, and reported that a proportion of TL chips were unable to measure accurately at 0.1-10mGy (19). A study by Kadir et al investigated the uncertainty associated with the energy response of TLD-100 to an ideal dose, which had a maximum deviation of 125.04% for Hp (0.07) against 45.22% for Hp (10) at 24keV, with the shallow dose exhibiting the higher uncertainty (20).…”

Interventional Radiology in Côte d’Ivoire: Analysis and Assessment of the Radiological Risk of the Surgical Team

“…The Harshaw 6600 Plus system, consisting of a reader and dosimeters whose performance characteristics and overall uncertainty [4] [5] were evaluated before use, allowed the doses received by the operators to be assessed according to their position in the room. For the dosimetric evaluation, each operator was equipped with one or more dosimeters to assess the effective dose and equivalent doses to the extremities and lens of the eye for the radiological procedure performed.…”