نتایج جستجو برای: radon reduction

تعداد نتایج: 498540  

Journal: :journal of biomedical physics and engineering 0
s. m. j. mortazavi professor of medical physics, department of medical physics and medical engineering, school of medicine, shiraz university of medical sciences, shiraz, iran. f. jamali master student, student research committee, school of medicine, shiraz university of medical sciences, shiraz, iran. j. moradgholi ph.d student of nanomaterials, department of materials engineering, isfahan university of technology, isfahan, iran. a. r. mehdizadeh assistant professor of medical physics, department of medical physics and medical engineering, school of medicine, shiraz university of medical sciences, shiraz, iran. r. faghihi radiation research center, mechanical engineering school, shiraz university, shiraz, iran. s. mehdizadeh radiation research center, mechanical engineering school, shiraz university, shiraz, iran.

background:  ramsar, a northern city in iran, lies on the coast of the caspian sea. this city has areas with some of the highest levels of natural radiation measured to date. the radon concentration in some areas of ramsar is up to 3700 bq m–3. on the other hand, due to high level of humidity, damp-proof barriers should be used in construction of new buildings in radon prone areas of this city....

A. R. Mehdizadeh F. Jamali J. Moradgholi M. Haghani M. R. Ghanbar-pour M. Saieedi R. Faghihi S. A. Mortazavi S. M. J. Mortazavi S. Mehdizadeh

Background: Ramsar, a northern city in Iran, lies on the coast of the Caspian Sea. This city has areas with some of the highest levels of natural radiation measured to date. The radon concentration in some areas of Ramsar is up to 3700 Bq m–3. On the other hand, due to high level of humidity, damp-proof barriers should be used in construction of new buildings in radon prone areas of this cit...

2007
Michael Kitto Charles Kunz Craig McNulty Michael Kuhland Scott Coven

Groundwater radon levels of 83 Bq/L (2240 PC&) generated indoor radon levels >3300 Bq/m3 (89 pCi/L) at a commercial fish hatchery. Passive and active mitigation strategies to reduce the waterborne radon levels included a packed column, a waterfall through perforated grates, surface aeration, and bottom bubblers. Though waterborne co~centrations were reduced up to 83% using a combination of miti...

1999
Y. Takeuchi K. Okumura T. Kajita S. Tasaka M. Nemoto Y. Fukuda H. Okazawa T. Hayakawa K. Ishihara H. Ishino Y. Itow J. Kameda S. Kasuga K. Kobayashi Y. Kobayashi Y. Koshio M. Miura M. Nakahata S. Nakayama Y. Obayashi A. Okada N. Sakurai M. Shiozawa Y. Suzuki H. Takeuchi Y. Totsuka S. Yamada M. Earl A. Habig E. Kearns M. D. Messier K. Scholberg J. L. Stone L. R. Sulak C. W. Walter M. Goldhaber T. Barszczak D. Casper W. Gajewski W. R. Kropp S. Mine L. R. Price M. Smy H. W. Sobel M. R. Vagins K. S. Ganezer W. E. Keig R. W. Ellsworth A. Kibayashi J. G. Learned S. Matsuno V. J. Stenger D. Takemori T. Ishii J. Kanzaki T. Kobayashi K. Nakamura K. Nishikawa Y. Oyama A. Sakai M. Sakuda O. Sasaki S. Echigo M. Kohama A. T. Suzuki T. J. Haines E. Blaufuss B. K. Kim R. Sanford R. Svoboda M. L. Chen J. A. Goodman G. W. Sullivan J. Hill C. K. Jung K. Martens C. Mauger C. McGrew E. Sharkey B. Viren C. Yanagisawa W. Doki M. Kirisawa S. Inaba K. Miyano C. Saji M. Takahashi M. Takahata K. Higuchi Y. Nagashima M. Takita T. Yamaguchi M. Yoshida S. B. Kim M. Etoh A. Hasegawa T. Hasegawa S. Hatakeyama K. Inoue T. Iwamoto M. Koga T. Maruyama H. Ogawa J. Shirai A. Suzuki F. Tsushima M. Koshiba Y. Hatakeyama M. Koike K. Nishijima H. Fujiyasu T. Futagami Y. Hayato Y. Kanaya K. Kaneyuki Y. Watanabe D. Kielczewska J. S. George A. L. Stachyra L. L. Wai R. J. Wilkes K. K. Young

Radioactivity from radon is a major background for observing solar neutrinos at Super-Kamiokande. In this paper, we describe the measurement of radon concentrations at Super-Kamiokande, the method of radon reduction, and the radon monitoring system. The measurement shows that the current low-energy event rate between 5.0 MeV and 6.5 MeV implies a radon concentration in the Super-Kamiokande wate...

Journal: :Environment international 2006
C J Groves-Kirkby A R Denman P S Phillips R G M Crockett A C Woolridge R Tornberg

Although United Kingdom (UK) Building Regulations applicable to houses constructed since 1992 in Radon Affected Areas address the health issues arising from the presence of radon in domestic properties and specify the installation of radon-mitigation measures during construction, no legislative requirement currently exists for monitoring the effectiveness of such remediation once construction i...

Journal: :Tidsskrift for den Norske laegeforening : tidsskrift for praktisk medicin, ny raekke 2017
Christina Søyland Hassfjell Tom Kristian Grimsrud William J F Standring Steinar Tretli

BACKGROUND Radioactive radon gas is generated from uranium and thorium in underlying rocks and seeps into buildings. The gas and its decay products emit carcinogenic radiation and are regarded as the second most important risk factor for lung cancer after active tobacco smoking. The average radon concentration in Norwegian homes is higher than in most other Western countries. From a health and ...

2007
Ashok Kumar

The Ohio Radon Information System (ORIS) internet site at http://www.uioledo.edu/-aprs/oris/ is one of the most comprehensive sites on indoor radon available on the World Wide Web. It was developed by the authors under a research grart from the Ohio Department of Health and U.S. Environmental Protection Agency. It is estimated that from 700 to 1300 people die annually in Ohio from radoninduced ...

2013
R. BANJANAC V. UDOVIČIĆ A. DRAGIĆ D. JOKOVIĆ D. MALETIĆ N. VESELINOVIĆ B. GRABEŽ

The reduction of the gamma-ray background contributes to the reduction of statistical errors of low activity measurements, while reduction of time variations of the background leads to lower systematic errors, especially in measurements of activities that coexist in the background. The sources of time variation of the background in a typical measurement of low activity are daily variations of r...

Journal: :Canadian journal of public health = Revue canadienne de sante publique 2002
Jerry M Spiegel Daniel Krewski

BACKGROUND The objective of this investigation was to determine the effectiveness of Canada's residential radon exposure guideline in influencing individuals' health protection decisions. METHOD Homeowners with known exposure levels in a high residential radon area (Winnipeg, Manitoba) were surveyed to document what they had done and spent to reduce their exposure to radon. The 507 respondent...

2017
Y. Nakano H. Sekiya S. Tasaka Y. Takeuchi M. Matsubara M. Nakahata

To precisely measure radon concentrations in purified air supplied to the Super-Kamiokande detector as a buffer gas, we have developed a highly sensitive radon detector with an intrinsic background as low as ± 0.33 0.07 mBq/m. In this article, we discuss the construction and calibration of this detector as well as results of its application to the measurement and monitoring of the buffer gas la...

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