This study presents the seasonal variation of indoor radon/thoron and their progeny concentrations measured in 50 dwellings Gurugram district Haryana state, India. Single-entry pinhole dosimeters were used for measurement radon thoron concentration, attached unattached progenies these gases, direct sensor with without wire-mesh employed. The absorbed inhalation dose to people area was calculate...

Study of radon, thoron and their progeny are important from radiological point view. This work is towards prediction, measurement, decay behavior, estimation associated factors effective dose for different room conditions (open closed). The levels measured experimentally using active monitors, dosimeters deposition-based sensors. Radon found uniformly distributed the open condition while shows ...

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...

A computer programwas developed to calculate the light scattered from an assembly of alpha particle tracks in a PADC film. The tracks were randomly seeded on the film to simulate the irradiation by alpha particles emitted by the naturally occurring radon gas and its short-lived progeny. The ray-tracing method was applied to simulate light propagation through the tracks. The angular distribution...

Calculation of lung dose from established lung dosimetry models requires use of the unattached fraction of potential alpha energy concentration (PAEC) of radon progeny and the activity median diameter (AMD) of attached radon progeny, in addition to the total PAEC. In the present work, for indoor environments without the nucleation mode of aerosols, a method based on the wire screen penetration ...

The radon and its progeny concentrations are measured near the surface of the earth at the Indian Institute of Tropical Meteorology, Pune, India. In-situ measurements of the meteorological parameters such as temperature and relative humidity are also made simultaneously. The concentrations show maxima in the early morning hours when the turbulence mixing is the minimum; whereas in the afternoon...

Mechanistic models for radon progeny induced lung cancer risk have been developed, based on radiation mechanisms at the cellular level. The cellular effects relevant to radiation-induced carcinogenesis are transformation, cell killing, stimulated cell division, and removal from contact inhibition. Depending upon the 115 ©Naturwissenschaftlich-Medizinischen Vereinigung in Salzburg; download unte...

ABSTRACT Aerosol size information is very important for risk estimation of radon exposure. Size measurements of aerosol particles attaching radon progeny were made by using the Dekati's ELPI (Electrical Low Pressure Impactor), and its attachment function was determined. The impactor, which covers a wide size range from 0.03 to 10 μm in diameter, gives number size distribution in real time by an...

Radon, Rn, is radioactive noble gas which decays by alpha emission with half-life of 3.825 d. Its short-lived progeny, Po, Pb and Bi (Po), are alpha and beta radioactive and they emit gamma radiation as well. Radon progeny can be inhaled by humans where they deposit on the inner layers of bronchi, and bronchioles. Particles (alpha, beta and gamma) emitted in radioactive decay damage surrounding...

background: radon and its daughter product are a major source of natural radiation exposure, the measurement of radon concentration in dwellings is assuming ever increasing importance. it is known from recent surveys in many countries that radon and its progeny contributes significantly to total inhalation dose and is well established that radon when inhaled in large quantity causes lung disord...