title: Evaluation of Effective Sources in Uncertainty Measurements of Personal Dosimetry by a Harshaw TLD System.
abstract: 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.
  
  
  METHODS
  These sources are included; inhomogeneity of TLDs sensitivity, variability 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-100 cards dosimeters as well as the hot gas Harshaw 6600 TLD reader system.
  
  
  RESULTS
  The individual uncertainties of each sources was measured less than 6.7% in 68% confidence level. The total uncertainty was calculated 17.5% with 95% confidence level.
  
  
  CONCLUSIONS
  The TLD-100 personal dosimeters as well as the Harshaw TLD-100 reader 6600 system show the total uncertainty value which is less than that of admissible value of 42% for personal dosimetry services.
authors.affiliation: Iran Nuclear Regulatory Authority, Tehran, Iran ; Radiation Application Research School, Nuclear Science and Technology Research Institute, Tehran, Iran.
authors.forename: Sm
authors.initials: S
authors.lastname: Hosseini Pooya
authors.affiliation: Iran Nuclear Regulatory Authority, Tehran, Iran.
authors.forename: T
authors.initials: T
authors.lastname: Orouji
keywords: Dose; Personal Dosimetry; Response; TLD; TLD Reader; Uncertainty