Document Details


Title:
OPERATION GREENHOUSE, SCIENTIFIC DIRECTOR'S REPORT OF ATOMIC WEAPON TESTS AT ENIWETOK, 1951; ANNEX 1.2, DELAYED GAMMA-RAY MEASUREMENTS; PART I, GAMMA-RAY SPECTRUM MEASUREMENTS (ABRIDGED) (DELETED)
Author(s):
GIBSON, H F [* NATIONAL BUREAU OF STANDARDS]; MILLER, W [* NATIONAL BUREAU OF STANDARDS]; MOTZ, J W [* NATIONAL BUREAU OF STANDARDS]; SMELTZER, J C [* NATIONAL BUREAU OF STANDARDS]; WYCOFF, H O [* NATIONAL BUREAU OF STANDARDS]
Subject Terms:
GREENHOUSE OPERATION; GAMMA DETECTION; GAMMA SPECTROSCOPY; GAMMA RADIATION; MEASURING METHODS; SPECTROMETERS; CRITERIA
Document Location:
Location - NNSA/NSO Nuclear Testing Archive Address - P.O. Box 98521 City - Las Vegas State - NV Zip - 89193-8521 Phone - (702)794-5106 Fax - (702)862-4240 Email - CIC@NV.DOE.GOV
Document Type:
REPORT
Publication Date:
1952 Apr 30
Declassification Status:
Sanitized
Document Pages:
0062
Accession Number:
NV0051292
Document Number(s):
WT76EX
Originating Research Org.:
NATIONAL BUREAU OF STANDARDS
OpenNet Entry Date:
1994 Aug 26
Description/Abstract:
THE MEASUREMENT OF BOMB EFFICIENCIES FROM THE NUMBER OF GAMMA-RAYS REQ UIRES FUNDAMENTALLY TWO SEPARATE EXPERIMENTS. THE AVERAGE NUMBER OF G AMMA-RAYS EMITTED FROM THE FISSION FRAGMENTS (DELAYED GAMMA-RAYS) PER FISSION MUST BE DETERMINED. THIS EXPERIMENT CAN BE CARRIED OUT IN THE LABORATORY. A SECOND EXPERIMENT, THE ABSOLUTE DETERMINATION OF THE NUMBER OF GAMMA-RAYS FROM THE BOMB WAS ALSO ATTEMPTED. BECAUSE GAMMA- RAYS ARE NOT DIRECTLY OBSERVABLE BUT ARE MEASURABLE ONLY THROUGH THEIR SECONDARY EFFECTS, AND BECAUSE THE PROBABILITY OF OCCURRENCE OF THE S ECONDARY EFFECTS DEPENDS UPON THE GAMMA-RAY ENERGY, IT IS NOT USUALLY POSSIBLE TO COUNT DIRECTLY THE NUMBER OF GAMMA-RAYS IN A HETEROCHROMAT IC SPECTRUM. A SPECTRAL DISTRIBUTION MUST BE FIRST OBTAINED FROM WHIC H THE ACTUAL TOTAL NUMBER OF GAMMA-RAYS MAY BE COMPUTED. THE PLANNING FOR THE EXPERIMENT AND THE SPECTRAL DISTRIBUTION OF COLLIMATED GAMMA- RAYS DETERMINED FROM THE GREENHOUSE TESTS ON TWO SHOTS ARE DISCUSSED I N DETAIL IN THIS VOLUME. A DISCUSSION OF MEASUREMENT OF BUILD-UP FACT OR WHICH IS NEEDED TO ESTIMATE THE EFFECT OF COLLIMATION IS ALSO GIVEN .


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