Ecology & Safety, Volume 19, 2025

Abstract: The TLD RADOS-2000-A dosimetric system is designed for measuring the ambient dose H*(10) related to environmental and workplace radiation. The system includes environmental thermoluminescent dosimeters and a thermoluminescent reader. Each dosimetric system must be calibrated before commissioning to establish the relationship between irradiation parameters and the measured controlled parameter. The relationship between the ambient dose H*(10) and the luminescence read by the thermoluminescent reader is applied for measurement. This dependency is influenced by the composition of the dosimeter tablets and the production conditions. Thus, batch homogeneity and dosimeter separation must be investigated. This article describes and documents the initial procedures in commissioning a dosimetric system—separation and calibration of the dosimeters. The methods applied are based on international standards and guidelines, as well as on the long-standing experience of NCRRP in using thermoluminescent dosimeters for measuring individual equivalent doses in personal dosimetric control. Various factors influence the readings of dosimetric calibration measurements. One significant factor is the angular dependence of the radiation incident on the dosimeters. At this stage, the effect was studied at incident angles of α = 0°, ±60°, and ±90°. The studies and calibrations were carried out using the G10 Gamma Beam Irradiator System, Hopewell Designs Inc., loaded with a 137Cs source. The system includes a positioning system, a reference measurement system (electrometer and ionization chamber). Using this system ensures high calibration accuracy and traceability of dosimetric measurements.