U. S. NAVAL RADIOLOGICAL DEFENSE LABORATORY
SAN FRANCISCO 24, CALIFORNIA
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REG: mle
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7 4059
Ne dowmgraded to
UNCLASSIFIED when separated from enclosure.
From:
Tos
Commanding Officer and Director
Department of Defense Agencies on Distribution List for Report
Subj:
U. S. Naval Radiological Defense Laboratory CONFIDENTIAL RESTRICTED DATA Report USNRDI-TR-1,6; forwarding of
Encl:
(1) U. S. Naval Radiological Defense Laboratory CONFIDENTIAL RESTRICTED DATA Report USNRDL-TR-1,6 entitled "Spectrometric
Analysis of Gamma Radiation from Fallout from Operation
REDWING"
1. Enclosure (1) is the fourth in a series of reports dealing with
analyses of gamma radiation from fallout samples at various weapons tests.
Previous reports were made for Operations UPSHOT-KNOTHOLE (USNRDL-420,
31 August 1953), CASTLE (USNRDL-TR-32,
(USNRDL-TR-106, 27 August 1956).
26 January 1955), and TEAPOT
2. Efficient arran;;aments for transportation of samples to the Laboratory allowed analyses to begin as early as 51 hours after shot time —
a notable improvement over the earliest-time receipt of four days
accomplished at Operation CASTLE, Other improvements have been made in
the way of refinements in instrumentation and analyzing techniques.
3.
Absolute photon intensities as a function of time are given for each
detectable gamma line from each sample,
Since the sample constituted an
accurately determined portion of the material taken from a fallout col-
lector of known area, an estimate can be made of the total gamma source
strength per unit area in the vicinity of the collecting site.
Dose
rates calculated for two samples agree within experimental error with
dose rates actually measured at the site.
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