Document Details
Title:
OPERATION SUN BEAM, SHOT SMALL BOY, PROJECT OFFICERS REPORT-PROJECT 7.10: SPECTRAL ANALYSIS WITH HIGH-TIME (DELETED)
Author(s):
MAHONEY, J J [ARMY NUCLEAR DEFENSE LABORATORY, U.S.]; HARRIS, L H [ARMY NUCLEAR DEFENSE LABORATORY, U.S.]; HENNECKE, H J [ARMY NUCLEAR DEFENSE LABORATORY, U.S.]; CLAFLIN, A B [ARMY NUCLEAR DEFENSE LABORATORY, U.S.]; FEKETE, M W [ARMY NUCLEAR DEFENSE LABORATORY, U.S.]
Subject Terms:
SUNBEAM PROJECT; SMALL BOY EVENT; THERMAL RADIATION; MEASURING METHODS; MEASURING INSTRUMENTS; DOMINIC II OPERATION
Document Location:
Location - DOE/NNSA 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 - NTA@NV.DOE.GOV
Document Type:
REPORT
Publication Date:
1963 Jun 14
Declassification Status:
Sanitized
Document Pages:
0066
Accession Number:
NV0051071
Document Number(s):
POR2247EX
Originating Research Org.:
ARMY NUCLEAR DEFENSE LABORATORY, U.S.
OpenNet Entry Date:
1994 Aug 26
OpenNet Modified Date:
2003 Sep 18
Description/Abstract:
THE PRIMARY OBJECTIVE OF PROJECT 7.10 CONDUCTED DURING THE NEVADA TEST SITE PHASE OF OPERATION SUN BEAM WAS TO INVESTIGATE THE SPECTRAL IRRA DIANCE AND LUMINOSITY VERSUS TIME FOR THE FIRST THERMAL PULSE AT SHOT SMALL BOY. THIS WAS ACCOMPLISHED BY USE OF SPECTRAL FILTERS WITH NARR OW BAND PASSES, PHOTOTUBES, AND MAGNETIC TAPE RECORDERS WITH HIGH TIME RESOLUTION AT TWO LOCATIONS. THE MEASURED ELAPSED TIME TO THE FIRST THERMAL MAXIMUM WAS FROM 50 TO 110 MICROSECONDS, DEPENDING ON WAVELENG TH. A GRAPH OF RADIANT THERMAL POWER VERSUS TIME WAS OBTAINED FOR THE THERMAL PULSE. THE DELINEATION OF THE FIRST THERMAL PULSE, ESPECIALL Y THE RISE PORTION, IS CONSIDERED TO BE MORE DEFINITE THAN HAS BEEN OB TAINED PREVIOUSLY. THE RESOLUTION TIME OF THE INSTRUMENTATION WAS APP ROXIMATELY 50 MICROSECONDS. SECONDARY OBJECTIVES WERE TO MEASURE THE TOTAL LUMINOSITY VERSUS TIME AND ALSO TO MEASURE THE ATMOSPHERIC ATTEN UATION. THESE OBJECTIVES WERE ACCOMPLISHED BY MAKING MEASUREMENTS AT TWO DISTANCES, 2.5 AND 3.5 MILES, FROM GROUND ZERO (GZ). IN THE CASE OF THE TOTAL LUMINOSITY MEASUREMENTS, A SYSTEM OF FILTERS WITH A SPECT RAL TRANSMITTANCE APPROXIMATING THE SENSITIVITY RESPONSE OF THE AVERAG E HUMAN EYE WAS USED. THE RESULTS ARE TABULATED IN THE REPORT.