Abstract
With the aim of offering a new application for 137 Cs sources that were previously used in brachytherapy, we developed an irradiator for TL and OSL dosimeters by adapting a shielded storage container; this irradiator was named SOPHIA. It was assembled from a cubic iron casing, filled with lead, with external dimensions of 25 × 25 × 25 cm 3 . It has three different drawers with two sample holders suitable for samples or dosimeters with dimensions of up to 2 cm. Dose distribution of the surface of sample holder was obtained with EBT-3 radiochromic film and detectors thermoluminescent CaSO4: Dy. Regarding the security conditions of irradiation, the whole routine procedure for placement and removal of samples was simulated using Monte Carlo code. The equipment presented proper security conditions and the doses received by users during procedures for placement and extraction of the samples are in accordance with international standards.
Highlights
This paper presents a set of techniques for the adaptation, assembly, and verification of safety conditions of a radiator suitable for 137Cs needles, which can be used by research centers, such as universities, in assessing the behavior of materials in the presence of gamma radiation and for the development of new dosimeters
To mount the radiator prototype, which was named SOPHIA, we used a shielded storage container formed by a 0.5-cm-thick iron shell with cubic dimensions of 25 × 25 × 25 cm completely filled with lead
The planar dose distributions obtained from the radiochromic films allowed us to know the dose deposition behavior on the sample holder surface
Summary
This paper presents a set of techniques for the adaptation, assembly, and verification of safety conditions of a radiator suitable for 137Cs needles, which can be used by research centers, such as universities, in assessing the behavior of materials in the presence of gamma radiation and for the development of new dosimeters
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