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Item type:Publication, Simple and low cost alternative method for detecting photoneutrons produced in some radiotherapy treatments using SSNTDs(Elsevier, 2020-07-01)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. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Concentric rings formation on etched LR-115 in bare mode by unconventional exposition(Elsevier, 2021-06-01)Some laboratories and institutions use bare LR-115 polymer (cellulose nitrate + polyester) as a nuclear track detector for radon measurements. They detect alpha particles from radon and its progeny products in the cellulose nitrate layer, whether emitted from the so-called effective volume located in front of the cellulose nitrate layer. However, concentric rings were recorded on the etched LR-115 detector when the possibility of alpha registration was canceled, and the polyester was exposed to natural radiation in different configurations. Concentric rings were formed, apparently, due to the thermally induced self-defocusing effect. The outdoor causative agent can heat and change the refractive index of polyester, generating latent concentric rings. In this work, different configurations have been studied to find the outdoor causative agents and to clarify the possible physical causes. Furthermore, results show reproducibility and suggest that the ultraviolet radiation can cause concentric rings on the cellulose nitrate layer.