Measurements and Monte Carlo simulations of the response of the RADOS personal dosemeters with MTS-N (LiF : Mg,Ti) and MCP-N (LiF : Mg,Cu,P) thermoluminescent detectors to X- and gamma-rays

摘要

The energy and angular response of the MTS-N (LiF:Mg,Ti) and MCP-N (LiF:Mg,Cu,P) TL detectors inside the RADOS personal dosemeters to X-rays photons in the energy range 16-250keV and incidence angles 0 degrees, 30 degrees, 40 degrees, 50 degrees, 60 degrees and (CS)-C-137 and Co-60 sources was measured. The irradiations were performed at the Dosimetry Laboratory of the Austrian Research Centers Seibersdorf. The dosemeters were centered on the front surface of the ISO water slab phantom (30 x 30 x 15cm(3)) and it-radiated with reference photon radiation qualities N (the narrow spectrum series), and S-Cs and S-Co nuclide radiation qualities, specified in ISO 4037 (1999). In addition, the energy response to photons of the dosemeter with MCP-N detectors has been calculated using the Monte Carlo transport code MCNP5. The simulation model of the personal dosemeter badge was set up according to the technical drawings. The results of simulations are in good agreement with measurements, except at the lowest (16 keV) photon energy. The results have confirmed that the RADOS personal dosemeter with MTS-N detectors (used by LADIS dosimetry service of the IFJ, Krakow) fulfils the requirements setup in the IEC 61066 (2006) technical recommendations for TL systems for personal dosimetry. These requirements are also fulfilled by the RADOS dosemeter equipped with highly sensitive MCP-N detectors.