Simple and low cost alternative method for detecting photoneutrons produced in some radiotherapy treatments using SSNTDs

Andrés Portocarrero Bonifaz, Oriol Bosch Moliné, Jose Olivares Schneider, Brian La Rosa La Rosa, Jhonny Rojas Hancco, Vanessa Guevara Rojas, Daniel Palacios Fernández, Patrizia Pereyra Anaya, María Elena López Herrera

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Resumen

A simple and low cost alternative which is able to identify thermal and fast neutrons in a clinical environment of radiotherapy is presented. CR-39 and LR-115 Solid State Nuclear Track Detectors (SSNTDs) were used, estimating their viability. In order to register alpha tracks due to thermal neutrons, natural boric acid tablets were placed in close contact to the detector, whereas in order to detect epithermal neutrons, some were additionally covered in a thin cadmium layer. Different configurations were assembled, changing the position of the converter with respect to the detector and the incident neutron fluence, which was evaluated in different positions of a radiotherapy table. The contribution due to environmental 222Rn and its daughters to the track density registered by the detector during the measurements was found to be negligible. It is concluded that the designed experimental set up constitutes a trustworthy and affordable method to carry out neutron measurements with the recommended configurations provided for the CR-39 detector, and not with LR-115.

Idioma originalInglés
Número de artículo109169
PublicaciónApplied Radiation and Isotopes
Volumen161
DOI
EstadoPublicada - jul. 2020

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