Abstract
Solid state nuclear track detectors (SSNTDs) have been widely used as sensors of radon and progeny in long-term dosimetry because they exhibit high detection properties while their cost is very low. Alpha-particle energy calculating codes, specific for every incident particle, increase the Monte-Carlo simulation time significantly. The expression of the alpha particle energy as a function of the distance travelled in SSNTD CR-39 was recently introduced as an alternative approximation for the simulation method. This chapter focused on modelling the response of bare CR-39 detectors to alpha-particles emitted by radon and progeny, through Monte-Carlo methods. In order to determine the efficiency of a combined use of bare CR-39 and cup-type detectors in radon measurements, theoretical and experimental CR-39 efficiency factors for alpha-particles were calculated. Modelling rendered calculation of effective volume for CR-39 detector, based on energy and angular distributions of alpha-particles emitted due to decay of radon and progeny. The relationship between equilibrium factor F and the recorded track density values ratio (of bare and cup-enclosed SSNTDs, respectively) R was calculated. The sensitivity factor kB for bare CR-39 was found equal to kB = (4.6 ± 0.6) [tracks × cm−2]/[kBq × m−3 × h] (assuming the Jacobi’s steady-state model), a value not significantly different from the corresponding kR cup-type value for radon and progeny.
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