Document Details


Title:
REPORT TO THE TEST DIRECTOR, OPERATION TEAPOT, NEVADA TEST SITE, FEBRUARY - MAY 1955, PROJECT 38.3, EVALUATION OF CIVIL DEFENSE RADIOLOGICAL DEFENSE INSTRUMENTS
Author(s):
Subject Terms:
TEAPOT 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:
1955 Feb 28
Declassification Status:
Unknown
Document Pages:
0057
Accession Number:
NV0006244
Document Number(s):
WT1190
OpenNet Entry Date:
1994 Aug 26
OpenNet Modified Date:
2003 Sep 18
Description/Abstract:
EXPERIMENTS WERE PERFORMED DURING OPERATION TEAPOT (1) TO INVESTIGATE THE BETA-GAMMA EXPOSURE-RATE RATIO FROM FALL-OUT TO ESTABLISH DESIGN C RITERIA FOR HIGH-RANGE SURVEY INSTRUMENTS, (2) TO EVALUATE COMMERCIAL RADIOLOGICAL DEFENSE INSTRUMENTS, AND (3) TO INVESTIGATE THE FEASIBILI TY OF THE USE OF COMMERCIAL AND AMATEUR ROLL FILM AND DENTAL X-RAY FIL M AS INDICATORS OF PROMPT GAMMA RADIATION. THE RESULTS OF THE BETA-GA MMA EXPOSURE-RATE RATIO MEASUREMENTS INDICATE THAT, FOR AN INSTRUMENT HAVING A BETA WINDOW OF THE ORDER OF 50 MILLIGRAMS/SQUARED CENTIMETERS THICKNESS, THE QUANTITY OF HAZARDOUS RADIATION NOT INDICATED BY THE I NSTRUMENT WILL NOT EXCEED A FACTOR OF 2. THIS FACTOR IS NOT CONSTANT WITH TIME POSTSHOT, NOR WOULD IT BE EXPECTED TO BE CONSTANT WITH FALL- OUT OVER DIFFERENT TYPES OF GROUND SURFACE, BUT IT DOES INDICATE A MAG NITUDE TO BE EXPECTED AND WILL SERVE AS A BASIS FOR COMPARISON OF DATA COLLECTED IN FUTURE TEST OPERATIONS. AN ANALYSIS OF THE ABSORPTION D ATA OF FISSION-PRODUCT RADIATION INDICATES THE PRESENCE OF HIGH-ENERGY BETA RADIAITON, LOW-ENERGY GAMMA RADIATION, AND SECONDARY X-RADIATION IN LARGE QUANTITIES IMMEDIATELY POSTSHOT. THE SOFT COMPONENT TENDS T O DIMINISH RAPIDLY, AND THE HIGH-ENERGY GAMMA RADIATION OF THE LONGER- LIVED FISSION PRODUCTS BECOMES PREDOMINANT AFTER APPROXIMATELY 2 DAYS. THE EVALUATION OF COMMERCIAL RADIOLOGICAL DEFENSE INSTRUMENTS INDICA TED THAT (1) SATISFACTORY CALIBRATION FACILITIES FOR THIS TYPE OF INST RUMENT MUST BE DEVELOPED, (2) IONIZATION-CHAMBER SURVEY METERS MUST HA VE SEALED CHAMBERS TO AVOID CHANGE IN SENSITIVITY WITH ALTITUDE, (3) A N OPERATIONAL CHECK RATHER THAN A SIMPLE BATTERY CHECK MUST BE PROVIDE D FOR ALL SURVEY METERS, AND (4) DOSIMETERS INTENDED FOR MONITORING AP PLICATIONS MUST NOT DEMONSTRATE LEAKAGE RESULTING FROM HIGH INITIAL EX POSURE AND MUST BE RELATIVELY INSENSITIVE TO BETA CONTAMINATION. EXPE RIMENTS PERFORMED TO INVESTIGATE THE FEASIBILITY OF THE USE OF COMMERC IAL AND AMATEUR ROLL FILM AND DENTAL X-RAY FILM AS INDICATORS OF PROMP T GAMMA RADIATION INDICATED THAT (1) COMMERCIAL AND AMATEUR ROLL FILM CAN BE USED AS PROMPT RADIATION DOSIMETERS PROVIDED THAT THE ACCURACY REQUIREMENTS ARE NOT TOO RIGID AND (2) DENTAL FILM EXPOSED TO THE PROM PT RADIATION GIVES A ROUGHLY SATISFACTORY RESULT WHETHER OR NOT SPECIA L FILTERS TO REDUCE ENERGY DEPENDENCE ARE USED.


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