Design, construction and characterization of a portable irradiator to calibrate installed ambient dose equivalent monitors
Year: 2013
Type: conference-paper
Abstract: Calibration of installed dose monitors measuring the ambient dose equivalent, H*(10), should be done periodically according to portuguese national law. These monitors are fixed on the wall of the facility, hospitals or any other installation and usually they are checked in situ. To be able to realize this calibration LMRI (Metrology Laboratory for Ionizing Radiation) constructed a portable irradiator made of lead with a 137Cs source. The dosimetric characterization of the irradiator was realized and the H*(10) was determined at several distances from the irradiator. The profiles at different distances from the irradiator have been performed either experimentally or using the MCNPX code and was observed that the full width at half maximum of the radiation field is a linear function of the distance to the irradiator. The influence of the wall where the monitors are installed was studied by Monte Carlo simulation and correction factors applied to the H*(10) are determined.
Authors: C. Oliveira, J. Cardoso, A. Carvalho, L. Santos
Institutions: Instituto Superior Técnico, Universidade Nova de Lisboa
Language: English
Subfield: Radiation
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
OpenAlex ID: W2002156732