Document Details


Title:
BIAS IN FALLOUT DATA FROM NUCLEAR SURFACE SHOT SMALL BOY AN EVALUATION OF SAMPLE PERTUBATION BY SIEVE SIZING
Author(s):
Subject Terms:
SMALL BOY EVENT; DOMINIC II OPERATION; FALLOUT; SAMPLING; PARTICLES; SEPARATION PROCESSES; DIAGRAMS
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:
1967 Jun 26
Declassification Status:
Unknown
Document Pages:
0023
Accession Number:
NV0060307
Document Number(s):
USNRDLTR6788
Originating Research Org.:
UNITED STATES NAVAL RADIOLOGICAL DEFENSE LABORATOR
OpenNet Entry Date:
1994 Aug 26
Description/Abstract:
EVALUATION OF SAMPLE BIAS INTRODUCED BY THE MECHANICAL SIEVING OF SMAL L BOY FALLOUT SAMPLES FOR 10 MINUTES REVEALED THE FOLLOWING: UP TO 20 PERCENT OF THE MASS AND 30 PERCENT OF THE GAMMA-RAY ACTIVITY CAN BE L OST FROM THE LARGE-PARTICLE (GREATER THAN 1400 MICRONS) FRACTION. THE PAN FRACTION (LESS THAN 44 MICRONS) CAN GAIN IN WEIGHT BY AS MUCH AS 79 PERCENT, AND IN ACTIVITY BY AS MUCH AS 44 PERCENT. THE GAMMA-RAY S PECTRA OF THE FRACTIONS WERE NOT NOTICEABLY ALTERED BY THE PROCESS. EXAMINATION OF UNBIASED PAN FRACTIONS (BEFORE MECHANICAL SIEVING) INDI CATED BIMODALITY OF THE MASS-SIZE DISTRIBUTION IN A SAMPLE COLLECTED 9 ,200 FEET FROM GROUND ZERO, BUT NOT IN A SAMPLE COLLECTED AT 13,300 FE ET.


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