Document Details
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Title:
Gamma Radiation Exposure as a Function of Distance, Operation Ranger
Author(s):
Storm, Ellery [Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)]
Document Type:
REPORT
Publication Date:
1951 Mar 28
Declassification Date:
1995 Dec 20
Declassification Status:
Declassified
Document Pages:
41 p.
Accession Number:
None
Document Number(s):
LA-1228
Originating Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
OpenNet Entry Date:
2015 Jun 27
OpenNet Modified Date:
2016 Jun 17
Description/Abstract:
Gamma radiation exposures as a function of distance were measured for Ranger tests A, Bl, E, B2, and F. The films used in this experiment covered an exposure range of,O.1 to 3,000 r, and were calibrated with a betatron operating at an effective energy of 3.0 mev. With the exception of test A, the ratios of the gamma radiation exposure at fixed distances gave calculated bomb yields which agreed to within 5% of the fireball measurements. On test A, a 30% lower yield was measured by this method. The 400 r slant range increased from 700 yards from the 1 KT tests to 1470 yards on the 22 KT test. The apparent mean free path of the gamma radiation was found to be about 400 yards. The neutron induced activity in the film and badge contributed 3 to 5% of the total exposure found on the film, while the neutron induced activity in the soil contributed <<1% of the total exposure.