Variation of radon-222 concentration in exposure systems air under different conditions of exposure

摘要: Abstract Simplified, laboratory scale systems, namely ordinary desiccators and cylindrical containers were tested with regard to their reliability as exposure systems for determining certain parameters of radon emanation from locally obtained crushed granite rock samples. The samples placed inside the systems. Activity concentration emanated in air increased increase mass sample desiccator length period. was high near granitic source but decreased vertical distance it when system semiclosed activity homogeneous completely closed. used assessing Ra-226 content some identified altered alkali found be: 0.024 Bq g −1 (0.65 pCig ). Rn-222 rate same was: 0.013 m −2 s (0.34 pCi Saturation density thickness a mixed pure granites be 116 cm . results agree general reported observations support used.