Authors:
K. Inn National Institute of Standards and Technology Gaithersburg MD USA

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Zhichao Lin National Institute of Standards and Technology Gaithersburg MD USA

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Zhongyu Wu National Institute of Standards and Technology Gaithersburg MD USA

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C. McMahon National Institute of Standards and Technology Gaithersburg MD USA

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J. Filliben National Institute of Standards and Technology Gaithersburg MD USA

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P. Krey U.S. Department of Energy Environmental Measurements Laboratory New York NY USA

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M. Feiner U.S. Department of Energy Environmental Measurements Laboratory New York NY USA

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Chung-King Liu Environmental Protection Agency Las Vegas NV USA

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R. Holloway Environmental Protection Agency Las Vegas NV USA

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J. Harvey International Technology Corporation Ridge TN USA

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I. Larsen Oak Ridge National Laboratory Oak Ridge TN USA

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T. Beasley Oregon State University Newport OR USA

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C. Huh Oregon State University Newport OR USA

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S. Morton USDOE Radiological and Environmental Sciences Laboratory Idaho Falls ID USA

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D. McCurdy Yankee Atomic Environmental Laboratory MA USA

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P. Germain Center d'Études Nucléaires de Fonteney-Aux-Roses Laboratoire de Radioécologie Marine France

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J. Handl Niedersächsisches Institut für Radioökologie Hannover Germany

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M. Yamamoto Kanazawa University Kanazawa Japan

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B. Warren Atomic Weapons Establishment Aldermaston UK

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T. Bates British Nuclear Fuels plc Sellafield UK

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A. Holms Laboratory of the Government Chemist Teddington UK

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B. Harvey Ministry of Agriculture, Fisheries & Food Lowestoft UK

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D. Popplewell National Radiological Protection Board Didcot, Oxfordshire UK

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M. Woods National Physical Laboratory Teddington UK

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S. Jerome National Physical Laboratory Teddington UK

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K. Odell Nuclear Electric Gravesend UK

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P. Young South of Scotland Electricity Board Hunterston UK

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I. Croudace Southhampton Oceanography Centre Southhampton UK

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Abstract  

In 1977, the Low-level Working Group of the International Committee on Radionuclide Metrology met in Boston, MA (USA) to define the characteristics of a new set of environmental radioactivity reference materials. These reference materials were to provide the radiochemist with the same analytical challenges faced when assaying environmental samples. It was decided that radionuclide bearing natural materials should be collected from sites where there had been sufficient time for natural processes to redistribute the various chemically different species of the radionuclides. Over the succeeding years, the National Institute of Standards and Technology (NIST), in cooperation with other highly experienced laboratories, certified and issued a number of these as low-level radioactivity Standard Reference Materials (SRMs) for fission and activation product and actinide concentrations. The experience of certifying these SRMs has given NIST the opportunity to compare radioanalytical methods and learn of their limitations. NIST convened an international workshop in 1994 to define the natural-matrix radionuclide SRM needs for ocean studies. The highest priorities proposed at the workshop were for sediment, shellfish, seaweed, fish flesh and water matrix SRMs certified for mBq per sample concentrations of 90 Sr, 137 Cs and 239 Pu + 240 Pu. The most recent low-level environmental radionuclide SRM issued by NIST, Ocean Sediment (SRM 4357) has certified and uncertified values for the following 22 radionuclides: 40 K, 90 Sr, 129 I, 137 Cs, 155 Eu, 210 Pb, 210 Po, 212 Pb, 214 Bi, 226 Ra, 228 Ra, 228 Th, 230 Th, 232 Th, 234 U, 235 U, 237 Np, 238 U, 238 Pu, 239 Pu + 240 Pu, and 241 Am. The uncertainties for a number of the certified radionuclides are non-symmetrical and relatively large because of the non-normal distribution of reported values. NIST is continuing its efforts to provide the ocean studies community with additional natural matrix radionuclide SRMs. The freeze-dried shellfish flesh matrix has been prepared and recently sent to participating laboratories for analysis and we anticipate receiving radioanalytical results in 2000. The research and development work at NIST produce well characterized SRMs that provide the world's environment-studies community with an important foundation component for radionuclide metrology.

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Journal of Radionalytical and Nuclear Chemistry
Language English
Size A4
Year of
Foundation
1968
Volumes
per Year
1
Issues
per Year
12
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 0236-5731 (Print)
ISSN 1588-2780 (Online)