Radon daughter plate-out measurements at SNOLAB for polyethylene and copper

Radon Measurements at the Femp

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...

Radon daughter exposure and lung cancer.

A study of the polyethylene membrane used in diffusion chambers for radon gas concentration measurements

Solid-state nuclear track detectors (SSNTDs) in diffusion chambers have been routinely used for long-term measurements of radon gas concentrations. In usual practice, a filter is added across the top of the diffusion chamber to stop the progeny from entering. Thoron can also be deterred from entering the diffusion chamber by using a polyethylene (PE) membrane. However, the thickness of the PE m...

Radon and Thoron Measurements at Special Underground Circumstances

In this study a comparative integrating radon (Rn) and thoron (Rn) survey executed at underground workplaces are discussed. Two types of solid state nuclear track detectors (Radopot and Raduet) were applied for survey at four sites: a manganese mine, a bauxite mine, a tourist cave and a hospital cave. Several numbers of detecting points were chosen at each site and 1-1 Raduet and Radopot detect...

Mobility spectra of radon daughter aerosols stored in a vessel.

The time variation in the mobility spectrum of radioactive charged particles , stored in a closed vessel, and the concentration ratio of positive to negative particles were studied by using a mobility spectrometer of parallel plates type. A remarkable variation in the mobility spectrum with the mobility ranging from 3 •~ 10-2 cm2/V•Esec. to 3 •~ 10-4 cm2/V•Esec. was observed during four hours. ...