Updated estimates of /sup 239/ /sup 240/Pu + /sup 241/Am inventory, spatial pattern, and soil tonnage for removal at Nuclear Site-201, NTS
Updated estimates of /sup 239/ /sup 240/Pu + /sup 241/Am inventory and spatial pattern in surface soil are given for Nuclear Site (NS)-201 in Area 18 of the Nevada Test Site (NTS). These new estimates are based on 712 /sup 241/Am soil concentrations including 185 data values not previously available. Estimates were obtained using essentially the same Kriging techniques and the estimated average /sup 239/ /sup 240/Pu to /sup 241/Am ratio of 7.5 used by Simpson and Gilbert (1980) to obtain previous results. Estimated concentration contours, 68% confidence bands for the contours and estimated median concentrations for 50 x 50 ft blocks are given. The total Pu + Am inventory estimated to be in the top 5 cm of soil over the 109 hectare study (an area 5.2 hectares larger than used by Simpson and Gilbert, 1980) is approximately 16.3 curies. The approximate 68% confidence interval on this inventory estimate is about 6.7 to 45.6 curies. It is estimated that about 58 acres (approx. = 23 hectares) of land in the study are contaminated at levels greater than 40 pCi/g which includes about 40 acres (approx. = 16 hectares) at levels greater than 160 pCi/g. Approximately 28,000 tons of soil would need to be removed (to 15 cm depth) to clean up all areas with estimated concentrates greater than or equal to 160 pCi/g. About 41,000 tons would require removal at the 40 pCi/g level. These new estimates of inventory and spatial patterns are within the range of sampling error of previous estimates obtained by Simpson and Gilbert (1980).
- Research Organization:
- Pacific Northwest Lab., Richland, WA (USA)
- DOE Contract Number:
- AC06-76RL01830
- OSTI ID:
- 5248472
- Report Number(s):
- PNL-SA-9588; CONF-810569-2; ON: DE82016831
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Terrestrial-- Radioactive Materials Monitoring & Transport-- Terrestrial Ecosystems & Food Chains-- (-1987)
54 ENVIRONMENTAL SCIENCES
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ACTIVITY LEVELS
ALPHA DECAY RADIOISOTOPES
AMERICIUM 241
AMERICIUM ISOTOPES
CLEANING
DECONTAMINATION
DISTRIBUTION
ECOLOGICAL CONCENTRATION
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
FALLOUT
HEAVY NUCLEI
ISOTOPES
NATIONAL ORGANIZATIONS
NEVADA TEST SITE
NUCLEI
ODD-EVEN NUCLEI
PLUTONIUM 239
PLUTONIUM 240
PLUTONIUM ISOTOPES
RADIOECOLOGICAL CONCENTRATION
RADIOISOTOPES
SOILS
SPATIAL DISTRIBUTION
US DOE
US ORGANIZATIONS
YEARS LIVING RADIOISOTOPES