Results 161 to 170 of about 12,532 (187)

STUDY OF 222Rn PERMEATION THROUGH POLYMER MEMBRANES: APPLICATION TO CONTINUOUS MEASUREMENT OF 222Rn IN WATER

Health Physics, 1992
Membranes that exclude water but are permeable to radon can extend the range of environments where many radon detection systems could operate. We have studied the permeation of 222Rn through polypropylene membranes separating air and water phases. The permeation coefficient and the activation energy were calculated for various conditions.
V, Labed, A, Rannou, G, Tymen
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Indoor 222Rn survey in Zacatecas State, Mexico

Applied Radiation and Isotopes, 2007
As part of a program for discovering whether afflicted areas exist, indoor (222)Rn concentrations in the State of Zacatecas were surveyed, (222)Rn concentration being measured by gamma-ray spectrometry of radon decay products adsorbed into charcoal canisters.
L L, Quirino, J M, Soriano, F, Mireles, J I, Dávila, H, López, J L, Pinedo, C, Rios   +6 more
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AIRBORNE 222Rn CONCENTRATION IN AN EGYPTIAN VILLAGE

Health Physics, 2002
The indoor radon concentration in a typical Egyptian village in Delta was measured in 50 houses during summer 1999 and winter 2000. This survey was done using three different types of charcoal canisters: 4" open-faced, 2.75" open-faced, and 2.75" diffusion barrier.
W, Arafa, H, El Samman, A, Ashry, A, Abd alla   +3 more
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Developing Soil Gas and 222Rn Entry Potentials for Substructure Surfaces and Assessing 222Rn Control Diagnostic Techniques

Health Physics, 1990
Research-based procedures for characterizing the causes of elevated indoor 222Rn levels and guiding the selection of an appropriate control technique were evaluated at seven New Jersey houses. Procedures such as thorough visual inspections, blower door air leakage tests, pressure field mapping, subsurface vacuum extension tests, sampling of 222Rn ...
B H, Turk, J, Harrison, R J, Prill, R G, Sextro   +3 more
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Prediction of 222Rn from Topography in Pennsylvania

Health Physics, 1991
The relationships of Rn levels in basements and first floors of homes to topographic location in a northeastern ridge and valley section of Pennsylvania were investigated. Topographic variables relating to elevation and slope were quantified and related to house Rn levels using both conventional and classification and regression tree (CART) analyses ...
I, Janssen, J H, Stebbings, M A, Essling, K M, Dimino, D L, Rodgers   +4 more
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Primary and secondary measurements of 222Rn

Applied Radiation and Isotopes, 2004
In the past few years, a primary measurement system has been established at the PTB allowing absolute measurements of 222Rn. The activity can be determined by counting the emitted alpha particles in a defined solid angle after condensing the radon at a cold point under vacuum conditions.
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Measurement of 222Rn Concentration in Kenyan Groundwater

Health Physics, 1998
Groundwater samples from different parts of Kenya have been analyzed for their 222Rn concentrations. Samples were drawn from municipal supplies, springs, wells and bore holes in different geological terrains. In the analysis, conventional liquid scintillation counting, using the Packard protocol for measuring radon in water, was employed.
Otwoma, D, Mustapha, AO
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Permeability of Caulking Compounds to 222Rn

Health Physics, 1992
Caulking compounds have been tested as 222Rn barriers. Of these, the most effective is GE acrylic Latex Silicone Caulk, 0.2 cm of which attenuates 222Rn by 98% to 99.9%. The same thickness of two commercial 222Rn barriers attenuates radon by 75% to 90%. Permeabilities range from 0.3 to 140 x 10(-8) cm2 s-1.
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Survey of Indoor 222Rn Concentrations in Hong Kong

Health Physics, 1991
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Leung, JKC, Tso, MYW
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Production and measurement of 222Rn standards

Applied Radiation and Isotopes, 1998
Abstract For the production of radon standards, 222 Rn is transferred from a solid 226 Ra source located in a vacuum system to different types of vessels such as glass bulbs or stainless steel cylinders. Using this radium source, up to 2 MBq of 222 Rn gas can be completely transferred when the radon is condensed in a liquid-nitrogen cooled vessel.
R Dersch, U Schötzig
openaire   +1 more source