Further studies on sensitivity of a LR-115 based radon dosemeter

A radon dosemeter widely used in Italy and other countries has a cylindrically shaped diffusion cell and contains two LR-115 detectors covered by a thin film of absorber as an energy degrader. The sensitivity of this dosemeter was first studied by means of a simplified model for track formation in LR-115, based on three independent parameters ( and the critical angle θc). In this work the model, which is based on analytic and standard numerical methods, has been modified to take into account the actual functional dependence of LR-115 response on alpha particle energy and incidence angle. The new computed sensitivity has been compared with a new set of experimental data obtained with absorber thickness ranging from 6 to 53 micrometer.