Document Details


Title:
OPERATION GREENHOUSE, SCIENTIFIC DIRECTOR'S REPORT OF ATOMIC WEAPON TESTS AT ENIWETOK, 1951: ANNEX 6.6, EVALUATION OF FILTER MATERIAL (DELETED)
Author(s):
ENGQUIST, E H [ARMY CHEMICAL CORPS]
Subject Terms:
GREENHOUSE OPERATION; AIR FILTERS; RADIOACTIVE CLOUDS; COMPARATIVE EVALUATIONS; EQUIPMENT
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:
1951 Jan 31
Declassification Status:
Sanitized
Document Pages:
0060
Accession Number:
NV0051019
Document Number(s):
WT19EX
Originating Research Org.:
ARMY CHEMICAL CORPS
OpenNet Entry Date:
1994 Aug 26
Description/Abstract:
FOUR TYPES OF STANDARD AND DEVELOPMENTAL FILTER MATERIALS USED IN INDI VIDUAL AND COLLECTIVE-PROTECTIVE DEVICES AND ONE TYPE OF DEVELOPMENTAL FILTER MATERIAL USED FOR THE SAMPLING OF AIR FOR PARTICULATE MATTER W ERE EVALUATED AGAINST THE CONTAMINATION PRODUCED BY THE DETONATION OF AN ATOMIC BOMB AND PRESENT IN THE RESULTING RADIOACTIVE CLOUD. THESE FILTER MATERIALS WERE EVALUATED IN MULTILAYER PADS AT THE STANDARD FLO W-RATE CONDITIONS USED BY THE CHEMICAL CORPS IN EVALUATION STUDIES OF FILTER MATERIALS. THIS PERMITTED CORRELATION OF RESULTS WITH LABORATO RY DATA. THE FILTER MATERIALS WERE EVALUATED IN EIGHT DRONES IN THE F IRST THREE TESTS AT ALTITUDES RANGING FROM 16,000 TO 30,000 FT. A POR TION OF THE CLOUD WAS CONTINUOUSLY SAMPLED ISOKINETICALLY BY A PROBE W HICK EXTENDED THROUGH THE NOSE OF THE AIRCRAFT. THE SAMPLE OF THE CLO UD PASSED FROM THE PROBE INTO A PLENUM CHAMBER, FROM WHICH IT WAS CONT INUOUSLY EXHAUSTED TO THE EXTERIOR OF THE AIRCRAFT. THE FILTER MATERI ALS WERE LOCATED ON A SUITABLE APPARATUS IN THE PLENUM CHAMBER AND EVA LUATED AGAINST CONTAMINATED AIR DRAWN FROM THIS CHAMBER. ANALYSIS OF THE FILTER MATERIALS WAS MADE BY COUNTING THE GROSS BETA ACTIVITY COLL ECTED ON SUCCESSIVE LAYERS OF THE SAME FILTER MATERIAL AND THE EFFICIE NCY OF THE MATERIAL WAS CALCULATED FROM THE DATA OBTAINED. SELECTED S SMPLES OF THE FILTER MATERIAL WERE ALSO COUNTED TO OBTAIN A MEASURE OF THE AMOUT OF THE ALPHA ACTIVITY PRESENT IN THE CLOUD. RADIOAUTOGRAPH S WERE MADE OF SELECTED SAMPLES TO DETERMINE THE DISTRIBUTION OF ACTIV ITY ON THE FILTER PAPERS. DECAY DATA WERE ALSO TAKEN ON SELECTED SAMP LES TO DETERMINE THE GROSS DECAY CONSTANT. N, IN THE EQUATION A-AOTN F OR ACTIVITY ASSOCIATED WITH PARTICULATE MATERIAL IN THE CLOUD. THE AV ERAGE VALUE WAS FOUND TO BE -1.08 DURING THE PERIOD H-HOUR PLUS 250 TO 2,000 HR. THE MEAN EFFICIENCY OF THE CHEMICAL CORPS TYPES 6,7,AND 8 RESPIRATORY PROTECTIVE FILTER MATERIAL IS 99.7 TO 99.9 PER CENT AGAIN ST THE GROSS PARTICULATE CONTAMINATION. THIS IS WITHIN THE LIMITS OF ACCURACY OF THE METHODS USED TO DETERMINE EFFICIENCY. THE MEAN EFFICIE NCY . THE MEAN EFFICIANCY OF TYPE 5 FILTER MATERIAL IS 84.1 PER CENT AND THAT OF THE POLYFIBER AIR-SAMPLING FILTER MATERIAL IS 74.3 PER CEN T. THESE DATA CORRELATE CLOSELY WITH LABORATORY DATA AND INDICATE THA T THE EFFICIENCY AGAINST A HIGH-INTENCITY RADIOACTIVE AEROSOL CLOUD IS COMPARABLE TO THAT MEASURED BY A NONRADIOACTIVE LABORATORY TEST AEROS OL


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