Long-term determination of airborne radon progeny concentrations using LR 115 detectors and the effects of thoron

V. W. Y Choi, C. K. M Ng, R. K. K Lam, M Janik, A Sorimachi, C Kranrod, D Nikezic, S Tokonami and K. N. Yu

Radiation Protection Dosimetry 141 ( 4 ): 404 - 407 , 2010