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Item type:Publication, Theoretical and experimental study of the LR-115 detector response in a non-commercial radon monitor(Elsevier, 2020-06-01)B.trαcks, a simulation program for SSNTD's sensitivity, has been developed to study the response of LR-115 (cellulose nitrate) and CR-39 (poly allyl glycol carbonate) nuclear track detectors. Detectors are located inside detector holders and are used for radon measurements. The program incorporates a variety of special features gathered together to achieve good agreement between theoretical approach and experimental results. The input parameters to study the detector response are radon exposure, geometry and dimensions of a detector holder (it can be cylindrical, conical or semi-spherical), entrance type for radon gas, detector type, and V function (four different functions were selected from literature). The output results are detector response and radon progeny distribution onto internal chamber walls. In this article, the response of the LR-115, which is placed inside a non-commercial-conductive radon monitor based on diffusion chambers called G2, was theoretically and experimentally studied. The common Monte Carlo simulation procedure and an alternative approach that replicates how monitors are exposed to different radon exposures were used as theoretical approaches. Experimental methodology was conducted in a radon test chamber from Italy (MI.AM s.r.l.). Comparison results of both theoretical and experimental methodology are presented and discussed. One of the major results, among others, shows that the monitor material (conductive or non-conductive) does not influence the LR-115 response. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Overlapping correction suitable for an LR-115 detector located inside a diffusion chamber(Elsevier, 2021-07-01)A simulation program based on Monte Carlo methods was developed to study the behaviour of the overlapping effect in the LR-115 nuclear track detectors located inside a diffusion chamber. The relation between the non-overlapped tracks and the radon exposure level that the detector was exposed was adopted. This study focuses on very high radon concentration levels found in soil gas, uranium mines, or underground places. These anomalous levels can influence the radiological risk related to inhalation of indoor radon or the spontaneous increases in thermal neutron background. LR-115 detector exposed to anomalous levels can register a large number of latent tracks on its surface. After an etching treatment, some visible tracks can be placed covering one or more visible tracks altering the LR-115 response. In order to develop this work and be more realistic, visible tracks were simulated taking into account radon exposure level, geometry and dimensions of the diffusion chamber, dimensions of the detector, the V function, the etching process and the reading process. Results show that the overlapping effect in the LR-115 inside a cylindrical diffusion chamber exposed to very high levels can be solved with an uncertainty of 5%. The same methodology can also be applied when considering other detectors and geometry and dimensions of a diffusion chamber. - 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.