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

Ali F. Nadir, Jabbar H. Juber, Abdul Ridha H. Subber1 & Noori H.N. Al-Hashimi
Department of Physics, college of education for pure science university of Basrah, Basrah, Iraq


Abstract

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.

Key Words:

Radon, Calibration factor, Diffusion factor, Transmission factor twin cup

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