Abstract
Problem statement: Uranium is a radiotoxic element found in trace qua ntities in alomost all natural accurring materials like soil, rock. Ra don an inert radioactive gas whose predecessor in uranium, is emitted from soil beneath the house and from building materials. Accurate knowledge of exhalation rate plays an important role in characte rization of the radon source strength in some building materials and soil. It is a useful quantit y to compare the relative importance of different sample of building materials and soil. Approach: This study provides an overview of measurements of radon exhalation rates for selected samples in E gypt were carried out using passive measuring techniques were measured by Can Technique using LR-115 type II plastic track detectors. Results: The radon concentration varies from 2.44-29 k Bq m -3 and the corresponding values of surface exhalation rates from 4.16-26.24 Bq m -2 . h the radium content 226Ra results in all samples under test in increasing order of magnitude. From the results it can be noticed that The lowest value of 226Ra is 7 Bq kg -1 in Sand sample, while the highest value is 85 Bq k g -1 Ordinary Cement. Conclusion: All the values of radium content in all samples under test were found to be quite lower than the permissible value of 370 Bq kg -1 recommended by Organization for Economic Cooperation and Development.
Highlights
Radon escapes or emanates from solid into the surrounding air is known as radon exhalation rate of the Exhalation of 222Rn, α-radioactive inert gas, is solid
EA is the radon exhalation rate expressed in Bq m−2h−1, C represents the integrated radon exposure (Bq.m-3.h), V is the effective volume of the can, t is the exposure time in hours (h), λ is the decay constant for radon (h−1) and A is cross-sectional area of the can (m2)
Where, EA is the radon exhalation rate expressed in Bq m−2h−1, C represents the integrated radon exposure (Bq.m-3.h), V is the effective volume of the can in (5.526×10−4 m3),Teff is the exposure time in hours (2028 h), λ is the decay constant for radon (h−1) and A is the area of the bottle (5.026×10−3 m2)
Summary
Radon escapes or emanates from solid into the surrounding air is known as radon exhalation rate of the Exhalation of 222Rn, α-radioactive inert gas, is solid. EA is the radon exhalation rate expressed in Bq m−2h−1, C represents the integrated radon exposure (Bq.m-3.h), V is the effective volume of the can, t is the exposure time in hours (h), λ is the decay constant for radon (h−1) and A is cross-sectional area of the can (m2).
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