Document Details


Title:
OPERATION HARDTACK-PROJECT 2.1: SHIPBOARD RADIATION FROM UNDERWATER BURSTS (DELETED)
Author(s):
BIGGER, M M [UNITED STATES NAVAL RADIOLOGICAL DEFENSE LABORATORY]; RINNERT, H R [UNITED STATES NAVAL RADIOLOGICAL DEFENSE LABORATORY]; ZAGORITES, H A [UNITED STATES NAVAL RADIOLOGICAL DEFENSE LABORATORY]
Subject Terms:
HARDTACK I OPERATION; WAHOO EVENT; UMBRELLA EVENT; UNDERWATER EXPLOSIONS; GAMMA RADIATION; MEASURING METHODS; RADIATION DOSES; SHIPS; CONTAMINATION; GAMMA DETECTION; RADIATION DETECTION; DOSE RATES; DECAY
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:
1961 Mar 24
Declassification Status:
Sanitized
Document Pages:
0111
Accession Number:
NV0051024
Document Number(s):
WT1619
Originating Research Org.:
UNITED STATES NAVAL RADIOLOGICAL DEFENSE LABORATOR
OpenNet Entry Date:
1994 Aug 26
Description/Abstract:
THE PRINCIPAL OBJECTIVES WERE: (1) THE DETERMINATION OF TOTAL GAMMA-RA DIATION DOSE AND DOSERATE HISTORIES ABOARD THREE MOORED SHIPS (DESTROY ERS) ESPOSED TO RADIOLOGICAL ENVIRONMENTS AT LOCATIONS OF POSSIBLE OPE RATIONAL INTEREST ABOUT THE SURFACE ZEROS OF TWO UNDERWATER NUCLEAR DE TONATIONS, SHOTS WAHOO AND UMBRELLA: (2) ESTIMATION OF REMOTE-SOURCE G AMMA-RADIATION DOSE AND DOSE-RATE HISTORIES AT EXPOSED WEATHER-DECK LO CATIONS ABOARD SHIP; (3) ESTIMATION OF TOTAL GAMMA-RADIATION DOSE AND DOSE-RATE HISTORIES IN THE WATER ADJACENT TO THE SHIPS; AND (4) MEASUR EMENT OF GAMMA-IONIZATION DECAY OF A FALLOUT SAMPLE COLLECTED ON ONE S HIP A FEW MINUTES AFTER EACH SHOT. THE SHIPS, WHICH WERE EQUIPPED WI TH OPERATING WASHDOWN SYSTEMS, WERE INSTRUMENTED WITH FILM BADGES AND GAMMA-INTENSITY-TIME RECORDERS (GITR'S). THE FILM BADGES AND UNSHIELD ED GITR'S SUPPLIED RADIATION DATA AT LOCATIONS REPRESENTING MAJOR BATT LE STATIONS; GITR'S SUBMERGED IN THE WATER SUPPLIED SOME DATA ON UNDER WATER RADIATION; AND A FALLOUT COLLECTOR CONNECTED TO A FULLY SHIELDED GITR SUPPLIED GAMMA-IONIZATION DECAY DATA. RADIATION HISTORIES WERE OBTAINED ON ONLY ONE SHIP FOR SHOT WAHOO. ALTHOUGH HISTORIES WERE OBT AINED ON ALL THREE SHIPS FOR SHOT UMBRELLA, SOME DATA WAS LOST BECAUSE OF SHOCK DAMAGE. AT LEAST 95 PERCENT OF THE TOTAL DOSE OBSERVED ON T HE WASHED WEATHER DECKS WAS ATTRIBUTED TO RADIATION FROM AIRBORNE RADI ATION FROM AIRBORNE RADIOACTIVITY. AFTER SHOT UMBRELLA, WEATHER-DECK DOSE ACCUMULATION (TO 75 PERCENT OF FINAL VALUES) RANGED BETWEEN 600 R RECEIVED WITHIN H-26 SECONDS AT 1.900 FEET FROM SURFACE ZERO AND 50 R RECEIVED WITHIN H+150 SECONDS AT 7,900 FEET FROM SURFACE ZERO. AFTER SHOT WAHOO, THE DOSE ACCUMULATION WAS SLOWER, BUT THE FINAL DECK DOSE S WERE ABOUT 300 R HIGHER, DESPITE THE FACT THAT THE SHIPS WERE FROM 1 ,000 TO 2,000 FEET FARTHER AWAY FROM SURFACE ZERO THAN WAS THE CASE FO R SHOT UMBRELLA. FOR NUCLEAR-WEAPON-DELIVERY SITUATIONS SIMULATED BY THE TWO CLOSER-IN SHIPS, TEMPORARY IMMOBILIZATION COULD RESULT IN LETH AL OR NEAR-LETHAL DOSES, AFTER SHOT WAHOO, THE MAJORITY OF COMPARTMEN TS RECEIVED DOSES IN EXCESS OF 500 R ABOARD THE CLOSEST SHIP AND IN EX CESS OF 200 R ABOARD THE NEXT-TO-CLOSEST SHIP. AFTER SHOT UMBRELLA, T HE TWO SHIPS RECEIVED DOSES IN EXCESS OF 200 R IN MANY COMPARTMENTS. RATIOS OF DOSE OR DOSE RATE IN COMPARTMENTS TO DOSE OR DOSE RATE ON WA SHED WEATHER DECKS WERE DEPENDENT UPON CHANGES IN RADIATION-SOURCE GEO METRIES AND UPON THE PRESENCE OF CONTAMINANTS WITHIN THE SHIPS. THE L LONG-TERM DOSE RATIOS RANGED BETWEEN 0.1 AND 0.7 FOR NONMACHINERY SPAC ES, AND BETWEEN 0.02 AND 0.2 FOR MACHINERY SPACES. ALTHOUGH RADIATION FROM THE WATER MAY HAVE INFLUENCED THE COMPARTMENT DECK DOSE-RATE RAT IOS TO A CONSIDERABLE DEGREE AT LATER TIMES, THE CONTRIBUTION OF CONTA MINATED WATER TO THE TOTAL DOSE OBSERVED ABOARD THE SHIPS WAS PROBABLY OF LITTLE SIGNIFICANCE. AFTER SHOT UMBRELLA, GAMMA-IONIZATION DECAY WAS MEASURED FOR THE PERIODS BETWEEN H+0.1 AND 11.5 HOURS AND BETWEEN H+23.0 AND 34.9 HOURS. NO DECAY MEASUREMENTS WERE OBTAINED FOR SHOT W AHOO.


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