The zero signal and glow curves of bare LiF:Mg,Ti detectors in a hot gas TLD system.

The uncertainty in very low doses measured with TLDs is partly caused by the uncertainty in the zero signal of the detector. A mathematical model for the thermodynamics of TLD heating and the zero signal in a hot gas reader with constant gas temperature is presented. The major component of the heating is described as diffusion limited conductive heating, the major component of the zero signal is black body radiation from the hot TLD.

Recent EULEP dosimetry intercomparisons for whole body irradiation of mice. European Late Effects Project group.

Purpose: To foster quality assurance of dosimetry among the institutes involved in joint studies on late effects of ionizing radiation.

Materials And Methods: The participants in the dosimetry intercomparison received for each facility two mouse phantoms loaded with LiF thermoluminescent dosemeters (TLD) and a control badge. The participants were requested to irradiate the test phantoms in the actual arrangement used for whole body irradiation of mice, such that the dose in the centre of the test phantoms was 2 Gy and the dose distribution was uniform.