Thoron interference in radon exhalation rate measured by solid state nuclear track detector based can technique

This paper presents the extent of thoron (220Rn) interference in the radon (222Rn) exhalation rate, measured by solid state nuclear track detector based ‘Can’ technique. Experiments were carried out following the standard procedure of ‘Can’ technique as well as active technique as a reference method for 222Rn and 220Rn exhalation measurements. It was found that 220Rn interference may lead to overestimation of 222Rn exhalation by a significant factor which can be as high as 12 depending upon the rate of 220Rn exhalation from samples.