The diffusion coefficient and calibration factors for indoor radon measurement in bare and twin cup modes

Volume 18 , Issue 1 , March 2016 , Pages 49-56

Authors

¹ Department of Physics, college of education for pure science university of Basrah, Basrah, Iraq

The calibration factor and diffusion are essential parameters in the solid state nuclear

track detectors dosimeters. In the present work, experiments were carried out to measure

the calibration factors for different modes of measurement in indoor radon dosimetry and

diffusion coefficient of gas filter used in the experiments. The calibration chamber

provides with standard radium source and radon vision instrument, was used as hybrid

combination between active and passive methods. The calibration factor was determined

through the relation between standard radon concentration, track density and exposure

time. The values of calibration factors was 0.020±0.005 Tr.cm -2 /Bq.m -3 .d for sponge cup

mode, 0.021±0.006 Tr.cm -2 / Bq.m -3 .d for filter cup mode and 0.029±0.008 Tr.cm -2 / Bq.m -

3 .d for bare mode respectively. The calibration factor for bare CR-39 was found to be

0.384±0.102 Tr.cm -2 / Bq.m -3 .d. The diffusion coefficients are 7.1x10 -13 m 2 /sec for filter

paper and 4.6x10 -9 m 2 /sec for sponge. The calibration of SSNTDs using hybrid method

between active and passive can be used to minimize the uncertainty in the calibration

factors.

Statistics