Aerial radiological survey of Areas 18 and 20 Nevada Test Site. Date of survey: October-November 1980
Radiological surveys were conducted over Areas 18 and 20 at the Nevada Test Site (NTS) during the period 10 October through 13 November 1980. Separate surveys of the two areas were conducted simultaneously using arrays of NaI(Tl) scintillation crystals mounted on Messerschmitt-Bolkow-Blohm BO-105 and Hughes H-500 helicopters. Exposure rate contour maps due to total terrestrial gamma ray activity were produced for both areas. The most frequently occurring range of exposure rates was 17 to 25 ..mu..R/h for both Areas 18 and 20; the total range varied from 12 to 2000 ..mu..R/h. These values include an estimated cosmic contribution of 6 ..mu..R/h. An isocount rate contour map showing the distribution of count rates measured in the spectral window sensitive to cesium-137 was produced to show the extent of man-made contaminants in Area 18. In a similar manner, an isocount rate contour map showing the distribution of count rates measured in a spectral window sensitive to cobalt-60 was used to show the extent of man-made contaminants in Area 20. The extent of man-made contamination from the effluents of the various events in both areas shows patterns indicative of the prevailing winds during and after the events. Except for the presence of low levels of cesium-137 activity in the eastern half of Area 18, all contaminants can be correlated with the effluents of the various events. In Area 18, cesium-137 activity appears to be spread over about 30 to 40 percent of the eastern half; it does not appear to be directly associated with the events in this area. The distribution and level of background radiation in the two areas are consistent with those measured during previous surveys.
- Research Organization:
- EG and G, Inc., Las Vegas, NV (USA). Remote Sensing Lab.
- DOE Contract Number:
- AC08-83NV10282
- OSTI ID:
- 5390448
- Report Number(s):
- EGG-10282-1093; ON: DE86014256
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products. Original copy available until stock is exhausted
- Country of Publication:
- United States
- Language:
- English
Similar Records
An aerial radiological survey of the Argonne National Laboratory and surrounding area, Argonne, Illinois
An aerial radiological survey of the Sandia National Laboratories and surrounding area
Related Subjects
CESIUM 137
RADIOECOLOGICAL CONCENTRATION
COBALT 60
NEVADA TEST SITE
RADIOACTIVITY
RADIATION MONITORING
ALKALI METAL ISOTOPES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CESIUM ISOTOPES
COBALT ISOTOPES
ECOLOGICAL CONCENTRATION
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
MINUTES LIVING RADIOISOTOPES
MONITORING
NATIONAL ORGANIZATIONS
NUCLEI
ODD-EVEN NUCLEI
ODD-ODD NUCLEI
RADIOISOTOPES
US DOE
US ORGANIZATIONS
YEARS LIVING RADIOISOTOPES
510300* - Environment
Terrestrial- Radioactive Materials Monitoring & Transport- (-1989)