Radon is a natural radioactive gas produced by the decay of uranium and thorium, which are present in all rocks and soils in small quantities. There are several isotopes of radon, the most important of which are 222Rn (produced from 238U) and 220Rn (produced from thorium). 220Rn is also known as thoron because of its parent radionuclide. In the United Kingdom, it has been shown that 220Rn deliv...

Doctors and nurses spent about 8 hours a day inside urban health centres examining a large number of patients. To assess radiation dose due to the attached and unattached fractions of the short-lived alpha-emitting radon decay products from the inhalation of air by working personnel and patients, concentrations of these radionuclides as well as those of radon and thoron gases were measured in i...

Radon is a natural radioactive gas produced by the decay of uranium and thorium, which are present in all rocks and soils in small quantities. There are several isotopes of radon, the most important of which are 222Rn (produced from 238U) and 220Rn (produced from thorium). 220Rn is also known as thoron because of its parent radionuclide. In the United Kingdom, it has been shown that 220Rn deliv...

background: several epidemiological studies conducted on underground miner’s show that exposure to elevated levels of radioactive radon gas is expected to increase the risk of lung cancer. relative risk of lung cancer is almost linear with radon exposure. elevated concentrations of radon are not only reported within mines but also for closed indoor environment of general public houses. measurem...

Background & Aims: Human beings are constantly exposed to different radiations that have always been recognized as a health hazard. Radon -222 and its daughter products are major sources of natural radiations and a significant total inhalation dose is related to them. Hence, the measurement of radon activity in the environment has gained an increasing importance. In this study, with the measure...

The present paper deals with the study of the multiple linear regression model for the estimation and prediction of the time series of radon and thoron progeny concentrations in atmosphere. The general purpose of multiple linear regression model is to find the linear relationship between a dependent (or explained) variable and several independent (or predictor) variables. Radon and thoron proge...

The report summarizes recent research and practice of using materials with high absorption ability to noble gases to measure their radioactive isotopes. Most of the studies employ bisphenol-A based polycarbonates, because of their remarkably high absorption ability to noble gases. This is the material of which commercial CDs/DVDs are made and they may serve as serendipitous, already available i...

INTRODUCTION UNSCEAR (1) reported that the effective doses due to inhalation of radon (Rn) and its progeny account on average for about one-half of all natural sources of radiation. In recent years, indoor surveys in Europe and Asia revealed that the dose contribution from thoron (Rn) and its progeny can equal to or even exceed that of Rn and its progeny (2). For assessment the public exposure ...

The dose conversion factors for short-lived thoron decay products were calculated using a dosimetric approach. The calculations were based on a computer program LUDEP, which implements the ICRP 66 respiratory tract model. The dose per equilibrium equivalent concentration for thoron (EETC) was calculated with respect to (1) equivalent dose to each region of the lung tissues (bronchial, bronchiol...