1 edition of Proposed standard for radon-222 emissions from licensed uranium mill tailings found in the catalog.
Proposed standard for radon-222 emissions from licensed uranium mill tailings
by U.S. Environmental Protection Agency, Office of Radiation Programs in Washington, D.C
Written in English
|Statement||prepared by: Jack Faucett Associates.|
|Contributions||Jack Faucett Associates., United States. Environmental Protection Agency. Office of Radiation Programs.|
|The Physical Object|
|Pagination||ix, 199 p. :|
|Number of Pages||199|
Unfortunately, this book can't be printed from the OpenBook. If you need to print pages from this book, we recommend downloading it as a PDF. Visit to get more information about this book, to buy it in print, or to download it as a free PDF. This paper presents a comparative study of Rn emanation from the ore and backfill tailings in an underground uranium mine located at Jaduguda, India. The effects of surface area, porosity, Ra and moisture contents on Rn emanation rate were examined. The study revealed that the bulk porosity of backfill tailings is more than two orders of magnitude than Cited by:
So far, radon exhalation rate of more t mBq/m 2 s have been recorded only on the surface of uranium tailings , where a high level of radon exhalation was . These left-over piles of radioactive sand are called "uranium tailings". Uranium tailings contain over a dozen radioactive materials which are all extremely harmful to living things. The most important of these are thorium, radium, radon (radon gas) and the radon progeny, including polonium
• Radon is formed from the decay of Uranium as part of a series of transformations referred to as a decay chain (see Figure 1). Radon is the radon isotope that causes the most concern, because of the natural abundance of Uranium in the earth’s crust and the health effects of its further decay products. Regulatory standard:a document that is suitable for use in compliance assessment and Measuring Airborne Radon Progeny at Uranium Mines and Mills may be used by uranium mine or mill licensees. BACKGROUND Radon– is a chemically inert element, a radioactive gaseous by-product of other naturallyFile Size: 94KB.
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40 CFR Part 61 EPA / National Emission Standards for Hazardous Air Pollutants PROPOSED STANDARDS FOR RADON EMISSIONS FROM LICENSED URANIUM MILL TAILINGS DRAFT ECONOMIC ANALYSIS January Prepared by: Jack Faucett Associates Wisconsin Avenue Suite Chevy Chase, Maryland Office of Radiation.
40 CFR Part 61 EPA / National Emission Standards for Hazardous Air Pollutants DRAFT BACKGROUND INFORMATION DOCUMENT PROPOSED STANDARD FOR RADON EMISSIONS FROM LICENSED URANIUM MILL TAILINGS Janu U.S.
Environmental Protection Agency Office of Radiation Programs Washington, D.C. Proposed standard for radon emissions from licensed uranium mill tailings. Washington, D.C.: U.S. Environmental Protection Agency, Office of Radiation Programs, (OCoLC) Additional Physical Format: Online version: Proposed standard for radon emissions from licensed uranium mill tailings.
Washington, D.C.: U.S. Environmental Protection Agency, Office of Radiation Programs, Licensed Uranium Mill Tailings Background Information Document. 40 CFR Part 61 of radon emissions from uranium tailings piles during the operational period of a uranium mill.
On April 6,standards for NRC licensees were proposed type of standard. On this page: Rule Summary; Rule History; Additional Resources; Compliance; Rule Summary. Subpart T limits radon emissions from uranium mill tailings tailingsThe remaining portion of a metal-bearing ore after some or all of a metal, such as uranium, has been extracted.
piles that are no longer operational. It limits ambient air emissions to twenty picocuries per square meter per. The commenter continued that the EPA's proposed rule continues to recognize the health hazards of uncontrolled radon emissions from uranium mill tailings and the rulemaking record confirms that CAA NESHAP regulation is a necessary part of the EPA's role in regulating uranium mill tailings pursuant to its CAA and UMTRCA authorities.
EPA has stated in the Final Rule for Radon Emissions from Licensed Uranium Mill Tailings: Background Information Document (August, ): “Recent technical assessments of radon emission rates from tailings indicate that radon emissions from tailings covered with less than one meter of water, or merely saturated with water, are about 2% of.
Subpart W protects the public and the environment from the emission of radon from uranium mills and their associated tailings. Since uranium ore generally contains less than one percent uranium, conventional uranium milling produces large quantities of tailings.
These tailings are collected in impoundments that vary in size from 20 to Stanford Libraries' official online search tool for books, media, journals, databases, government documents and more.
Radon Emissions from Uranium Mill Tailings Piles. Measurement and Calculation of Radon Flux from Uranium Mill Tailings Piles.
Frequency of Flux Measurement. A single set of radon flux measurements may be made, or if the owner or operator chooses, more frequent measurements may be made over a one year period. These measurements may. Proposed standard for radon emissions from licensed uranium mill tailings: draft background information document.
(Washington, D.C.: U.S. Environmental Protection Agency, Office of Radiation Programs, ), by United States. Environmental Protection Agency. Office of Radiation Programs (page images at HathiTrust). Draft Background Information Document, Proposed Standard for Radon Emissions to Air from Underground Uranium Mines, US EPA, Office of Radiation Programs, 40 CFR P National Emission Standards for Hazardous Air Pollutants.
Uranium tailings are a waste byproduct of uranium mining, raw uranium ore is brought to the surface and crushed into a fine sand. The valuable uranium-bearing minerals are then removed via heap leaching with the use of acids or bases, and the remaining radioactive sludge, called "uranium tailings", is stored in huge impoundments.
A short ton ( kg) of ore yield one. The effective dose from inhalation of 1 mg uranium mill tailings left over from an ore with a grade of % U is µSv (for higher ore grades, the dose increases correspondingly).
The 1 mSv annual standard for the public is equivalent to 2 g. For continuous exposure, this corresponds to a uranium mill tailings concentration in air of µg. For a given situation, the Cover Radon Retention can be calculated with the Uranium Mill Tailings Cover Calculator.
Cover: Radon Release Rate Limit [Bq/m 2 s] Maximum radon release rate from the covered tailings. The U.S. EPA standard (40 CFR ) is 20 pCi/m 2 s, which is equivalent to Bq/m 2 s.
-- Applies to radon emissions from operating uranium mill tailings -- flux standard: 20 pCi/m2-sec After 12/15/, new impoundments must meet one of two new work practices to achieve at least equivalent emissions reductions Phased disposal – Impoundment size of 40 acres or less Continuous disposal – dewatered tailings with no.
Dispersion of Radon in the Atmosphere Around Old Uranium Mill Tailings Conference Paper (PDF Available) in Nukleonika -Original Edition- 55(4) May with 89. This paper presents an extensive literature review on the various sources of radon such as ore body, backfill mill tailings, broken ore and mine water in underground uranium mines.
This review also comprehensively investigates the influence of intrinsic factors such as ore grade, Ra content, water content, porosity and surface area of the materials and the extrinsic Cited by: 5. The USEPA has promulgated 40 CFR P Subpart W, to protect the public and the environment from the emission of radon from uranium mills and their tailings.
11 This standard limits the radon emissions rate to 20 picocuries per square meter per second, and requires that new tailings impoundments meet one of the two following requirements.
Extraction of uranium from its ore is accompanied with production of a huge amount of uranium tailings that represent large masses of low level radioactive contaminants (Landa, ; Tan et al., a).These tailing are the major source of radon Cited by: 2.Radiological safety: The uranium ore generally contains all radio-isotopes present in its decay series which assume significance at various stages of operations.
The radon (a short lived, gaseous radionuclide) and its progeny may lead to internal exposure, if inhaled. This is particularly true in underground mines.Subpart B requires that the “Emissions of radon to the ambient air from an underground uranium mine shall not exceed those amounts that would cause any member of the public to receive in any year an effective dose equivalent of 10 mrem/y.” (40 C.F.R.