Evaluation of Effective Sources in Uncertainty Measurements of Personal Dosimetry by a Harshaw TLD System

Background: The accurate results of the individual doses in personal dosimety which are reported by the service providers in personal dosimetry are very important. There are national / international criteria for acceptable dosimetry system performance.Objective: In this research, the sources of uncertainties are identified, measured and calculated in a personal dosimetry system by TLD.Method: These sources are included; inhomogeneity of TLDs sensitivity, variabil- ity of TLD readings due to limited sensitivity and background, energy dependence, directional dependence, non-linearity of the response, fading, dependent on ambient temperature / humidity and calibration errors, which may affect on the dose responses. Some parameters which influence on the above sources of uncertainty are studied for Harshaw TLD-۱۰۰ cards dosimeters as well as the hot gas Harshaw ۶۶۰۰ TLD reader system.Results: The individual uncertainties of each sources was measured less than ۶.۷% in ۶۸% confidence level. The total uncertainty was calculated ۱۷.۵% with ۹۵% confi- dence level.Conclusion: The TLD-۱۰۰ personal dosimeters as well as the Harshaw TLD-۱۰۰ reader ۶۶۰۰ system show the total uncertainty value which is less than that of admis- sible value of ۴۲% for personal dosimetry services.

کلیدواژه ها:

TLD ، Uncertainty ، Personal Dosimetry ، TLD Reader ، Dose ، Response