Document Detail

Radioanalytical studies of fallout 63Ni.
MedLine Citation:
PMID:  1310303     Owner:  NLM     Status:  MEDLINE    
Fallout of Nickel-63 (T1/2 = 100 a) produced in small amounts at nuclear weapon tests following the neutron activation of weapon construction material was investigated by studying carpets of lichen collected during 1961 to 1988 at the Lake Rogen district in central Sweden (62.3 degrees N, 12.4 degrees E). The maximal level of 63Ni in the lichen carpet, which occurred in 1964, was about 0.6 Bq kg-1, dry weight, and decreased to 0.1 Bq kg-1 in 1988. The deposition pattern for 63Ni was similar to other fallout radionuclides such as 137Cs, 90Sr and 239 + 240Pu. The concentrations of stable Ni were relatively constant at 0.5 to 1.0 microgram g-1 throughout the years resulting in, for example, a specific activity (63Ni/stable Ni) of 0.5 Bq mg-1 in 1964 and 0.1 Bq mg-1 in 1988. The total area content of 63Ni was estimated to be 1.0 Bq m-2 and the activity ratio 63Ni/60Co was estimated to be 0.03 in 1966. The Chernobyl accident in April 1986 did not significantly increase the levels of 63Ni. For the measurement of these extremely low-levels of 63Ni, 200 g of dry material (about 1 kg fresh) were ashed and leached with aqua regia after hydroxides had been precipitated with ammonia, leaving Ni in the aqueous phase. Nickel was extracted as a dimethylglyoxime complex by chloroform and back-extracted with HCl. Finally, Ni was electroplated onto copper discs from an ammonium sulfate medium at high pH. The radiochemical yield was determined by atomic absorption spectrometry of stable Ni before and after electrodeposition.(ABSTRACT TRUNCATED AT 250 WORDS)
E Holm; P Roos; B Skwarzec
Related Documents :
17941733 - Use of delta(13)c and delta(15)n, and carbon to nitrogen ratios to evaluate the impact ...
16738653 - The cenozoic palaeoenvironment of the arctic ocean.
24064183 - 5-ht1a receptor antagonists reduce food intake and body weight by reducing total meals ...
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  International journal of radiation applications and instrumentation. Part A, Applied radiation and isotopes     Volume:  43     ISSN:  0883-2889     ISO Abbreviation:  Int J Rad Appl Instrum A     Publication Date:    1992 Jan-Feb
Date Detail:
Created Date:  1992-03-02     Completed Date:  1992-03-02     Revised Date:  2009-06-04    
Medline Journal Info:
Nlm Unique ID:  8611097     Medline TA:  Int J Rad Appl Instrum A     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  371-6     Citation Subset:  IM    
Department of Radiation Physics, Lund University, Sweden.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Nickel / analysis*
Nuclear Warfare*
Radioactive Fallout / analysis*
Radioisotopes / analysis*
Reg. No./Substance:
0/Radioactive Fallout; 0/Radioisotopes; 7440-02-0/Nickel

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  Measurements of actinide gut-transfer factors in humans.
Next Document:  The measurement of technetium-99 and iodine-129 in waste water from pressurized nuclear-power reacto...