TL-based dosemeter for measurement of low level photon radiation

Results from the calibration of a TL-based personal dosemeter for measurements of low levels of external photon radiation are presented. The lower limit of detection is 2 to 3 μGy, depending on the photon energy. In the energy range 40 to 180 keV the dosemeter will also provide information concerning the effective energy of the photon field. The uncertainty in the dose measurements is estimated to 10% for the energy range 40 to 180 keV, and the same for natural background radiation/Cs-fallout. For photon radiation of unknown energy in the range 180 keV to 1.24 MeV, the uncertainty due to the energy response is approx. 30%. 5 refs., 5 figs., 3 tabs