Environmental radon monitoring activities at the DOE Femald Environmental Management Project (FEMP) have been conducted extensively since the early 1980s. Monitoring has been conducted at ambient concentration levels (< 1 pCVL Rn-222), inside buildings, and at significantly elevated levels (hundreds of thousands pCiL Rn222) within the K-65 silos that store concentrated radium bearing wastes. Th...

Although thoron (2201Zn) was recognized as a potential source of radiation exposure in homes twenty yearsago, only a few homes in the United States have been measured for thoron. Early indoor surveys suggested that thoron concentrations would generally be low, highly variable, and make a poor surrogate for thoron pro eny dose. Howeyer, 522 recent reports of significant thoron interference with ...

This paper reviews some aspects of solid-state nuclear track detectors (SSNTDs) and their applications in the radon and other research fields. Several geometrical models for the track growth given in the literature are described and compared. It is found that different models give close results for the dimensions of track openings. One of the main parameters that govern track formation is the b...

Researchers around the world had already established that radon and thoron are a hazard to the human health. Different techniques and methods are applied in order to measure them as accurately as possible. In Romania, most measurements earlier conducted were focused on using grab-sampling measurements to establish the two gasses decay progeny activity concentration; however, recently, there has...

A passive diffusion method for the determination of radon concentration has been optimised and calibrated. The device consists of a scintillation vial containing activated charcoal, a diffusion barrier and a desiccant agent. The response to diverse atmospheric humidity and variable exposure intervals was studied. The result is a detector independent of atmospheric humidity till 7 days of exposu...

Abstract This paper describes cooperation of the Slovak University Technology in Bratislava (STU) and Institute Metrology (SMU) verification calibration factors for solid-state nuclear track detector utilized radon dosimetry establishing traceability STU laboratory. The SMU operates Air Radon Standard which consists a chamber calibrated atmosphere monitoring system. A specification is that conc...

Approximately half of the human exposure to radiation is due to indoor airborne shortlived progeny (decay products) of the radon gas (Rn). To measure the airborne concentrations of radon gas and/or its progeny, Nuclear Track Detectors (NTDs) are usually employed. The NTDs register the alpha particles emitted by radon gas and its progeny in the form of tracks in the NTDs, which will become visib...

In an effort to evaluate the prevalence of radon disclosure during real-estate transactions, surveys of recent home buyers regarding radon awareness, testing, and remediation were conducted in 26 counties in four regions of New York State. A 1999 survey, canvassing 2220 buyers in 12 counties, produced 647 responses. The 2002 survey, canvassing 5299 buyers in 14 different counties, produced an a...