Track Parameters and Etch Rates in Alpha-Irradiated CR-39 Detectors Used for Dosemeter Response Calculation

Abstract

The response of CR-39 to alpha particles has to be studied when CR-39 detectors are used in radon or neutron dosimetry. In order to calculate the dosemeter response it must be known whether a primary or secondary alpha particle at a given energy and direction is able to produce a visible etched track or not. For this purpose, track lengths and diameters were measured as a function of the initial alpha energy and etching time. The results allowed the depth dependent track etch rates to be derived and also their relation to the restricted energy loss along the alpha particle trajectory. Using this relationship track parameters can be reconstructed for any energy and direction. Thus, a comprehensive data set was obtained which can be used for deriving the critical angle of alpha registration needed in dosemeter response computation.