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Main Title Penetration into concrete of gamma radiation from fallout /
Author Titus, W. F.,
Publisher Federal Civil Defense Administration, Civil Effects Test Group,
Year Published 1958
OCLC Number 666805907
Subjects Operation Plumbbob, Nev, 1957 ; Concrete--Effect of radiation on ; Nuclear bomb shelters--United States ; Nuclear weapons--Safety measures ; Blast effect ; Nuclear explosions ; Blast effects
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
ERAM  TK9210.T58 1958 Region 9 Library/San Francisco,CA 10/21/2013
Collation 32 pages : illustrations ; 28 cm.
"February 1958." "Issuance Date: August 22, 1958." Misc. No.: ITR-1477,Report No.: 0001865. Misc. No.: Project 35.1. Accession No.: 53489. Penetration in concrete of gamma radiation from fallout has been measured in an idealized geometry as a function of time after a nuclear detonation. At the same time the exposure dose rate in air at heights of 3 and 9 ft above the ground was measured with detectors shielded to be primarily sensitive to fallout radiation on the ground. A sandwich made of seven concrete slabs forming a mass of concrete with face dimensions large enough to reduce edge effects to a negligible amount was buried with its top surface flush with the ground. Ten remote-reading detectors were placed between the seven concrete slabs at intervals equal to approximately 1.4 mean free paths of concrete to a maximum depth of approximately 10 mean free paths. Two detectors, shielded from above with lead, were suspended in air from a tower at heights of 3 and 9 ft above the ground. The concrete mass and the tower were in the center of a cleared and leveled area approximately 200 yards in diameter. Thus the gamma radiation at the detectors resulted from an effectively infinite-plane source of radiation. Results are presented both as a function of time after the detonation and of depth of penetration of the radiation in concrete. Comparison of the results with theoretical calculations is made.