Abstract
A simple alpha-track measurement technique for the equilibrium equivalent thoron concentration (hereafter called EETC) using a CR-39 detector was discussed. Detection properties of the CR-39 detector were examined with regard to detection efficiencies for incident energy and angles, respectively. Since more than 90% of the EETC is dominated by the 212Pb concentration, its practical evaluation can be achieved even though the 212Bi concentration is ignored. In this technique, the CR-39 detector is directly placed on a filter after an air sample is taken and an adequate time elapses (radon progeny completely decay). In order to confirm the reliability of measured values, the technique was compared with an alpha spectroscopic method. There was a relatively good agreement between the two.
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