Document Details


Title:
ACCURACY AND SENSITIVITY OF FILM MEASUREMENTS OF GAMMA RADIATION - PART III ( HEALTH PHYSICS, VOL. 9, P.769-777, RECEIVED: 12/26/62; REVISED: 2/15/63 )
Author(s):
KATHREN, R L [UNIVERSITY OF PITTSBURGH]; BRODSKY, A [UNIVERSITY OF PITTSBURGH]
Subject Terms:
PHOTOGRAPHIC FILMS; RADIATION EFFECTS; AIR; DATA; RESEARCH PROGRAMS; GRAPHS; SENSITIVITY
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:
JOURNAL ARTICLE
Publication Date:
1963 Feb 15
Declassification Status:
Never classified
Document Pages:
0009
Accession Number:
NV0067301
Originating Research Org.:
HEALTH PHYSICS
OpenNet Entry Date:
1994 Aug 26
Description/Abstract:
MEASUREMENTS HAVE BEEN MADE ON SEVERAL PERSONNEL MONITORING FILMS TO D ETERMINE THE EFFECTS OF ENVIRONMENTAL TEMPERATURES AND HUMIDITIES ON F ILM SENSITIVITY DURING GAMMA IRRADIATIONS OF 1-4 HR DURATION. FILMS WE RE EQUILIBRATED IN THE ENVIRONMENTS FOR PERIODS RANGING FROM 1 HR TO 1 WEEK BEFORE IRRADIATION, AND WERE DEVELOPED AT INTERVALS RANGING FROM 1/2 HR TO 1 WEEK FOLLOWING TERMINATION OF IRRADIATION AND REMOVAL FRO M THE ENVIRONMENT. SHARP DECREASES IN GAMMA SENSITIVITY TO AS LOW AS 5 0 PER CENT WERE FOUNDS IN ALL EXPERIMENTS AT 27 DEGREES CELSIUS (80 DE GREES FEHRENHEIT) AS RELATIVE HUMIDITY INCREASED ABOVE ABOUT 60-70 PER CENT. INCREASING TEMPERATURES UP TO 49 DEGREES CELSIUS RANGE. FOR CER TAIN FILMS AND EXPOSURE CONDITIONS A DEFINITE REDUCTION BELOW OPTIMUM SENSITIVITY WAS ALSO NOTED FOR EXPOSURES AT VERY LOW HUMIDITIES. BOTH DUPONT AND KODAK FILMS REQUIRED ABOUT 72 HR EQUILIBRATION UNDER HIGH HUMIDITY CONDITIONS TO REACH EQUILIBRIUM MOISTURE CONTENT; RELATIVE S ENSITIVITIES DURING IRRADIATION WERE INDEPENDENT OF EQUILIBRATION TIME FOR LONGER EQUILIBRATIONS. THE RESULTS INDICATE THAT HUMIDITY PROTECT ION MAY BE DESIRABLE EVEN FOR FILM PACKETS USED ONLY FOR SHORT WEARING INTERVALS. CHEMICAL MECHANISMS ARE POSTULATED AS PLAUSIBLE EXPLANATIO NS FOR THESE PHENOMENA.


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