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.

一些实验室和机构使用裸露的LR-115聚合物（硝酸纤维素+聚酯）作为ra测量的核径迹检测器。他们从硝酸纤维素层中的ra及其后代产物中检测出α粒子，而这些粒子是否来自位于硝酸纤维素层前面的所谓有效容积。但是，当消除了Al配准的可能性时，在蚀刻的LR-115检测器上记录了同心环，并且聚酯以不同的配置暴露于自然辐射下。显然，由于热诱导的自散焦效应，形成了同心环。该室外起因剂可以加热并改变聚酯的折射率，从而产生潜在的同心环。在这项工作中，已经研究了不同的配置以找到室外的致病因素并阐明可能的物理原因。此外，结果显示出可再现性，并表明紫外线辐射可在硝酸纤维素层上引起同心环。