Document Details


Title:
EFFECTS OF SURFACE IRREGULARITIES ON RADIATION LEVELS
Author(s):
FODERARO, A [UNIVERSITY OF PENNSYLVANIA]; KENNEY, E [UNIVERSITY OF PENNSYLVANIA]; LUCKOW, T [UNIVERSITY OF PENNSYLVANIA]; SIMON, J [UNIVERSITY OF PENNSYLVANIA]
Subject Terms:
SCINTILLATION COUNTERS; RADIATION DOSES; SOILS; FALLOUT; CALCULATIONS; DIAGRAMS; GRAPHS
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:
1968 Dec 31
Declassification Status:
Never classified
Document Pages:
0118
Accession Number:
NV0060765
Document Number(s):
NDLTR100
Originating Research Org.:
UNIVERSITY OF PENNSYLVANIA
OpenNet Entry Date:
1994 Aug 26
Description/Abstract:
SCINTILLATION SPECTROMETER PULSE HEIGHT SPECTRUMS FOR SURFACE ROUGHNES S TESTS SPONSORED BY THE U.S. ARMY NUCLEAR DEFENSE LABORATORY WERE UNF OLDED BY THE METHOD OF N.E. SCOFIELD. AFTER ADJUSTING THE DATA TO COM PENSATE FOR EACH OF EIGHT TEST SURFACES. A MONTE CARLO MODEL WAS DEVE LOPED WHICH USED AN EQUIVALENT GROUND OVERLAYER THICKNESS TO SIMULATE SURFACE ROUGHNESS EFFECTS. MONTE CARLO RESULTS PREDICTED THAT MAXIMUM DOSE OCCURS AT A LOWER HEIGHT THAN THAT OF THE EXPERIMENTAL DATA. A MODIFICATION OF THIS MONTE CARLO PROGRAM, WRITTEN TO DETERMINE WHAT AN GULAR DEPENDENCE, IF ANY, DOSE HAD AWAY FROM A POINT SOURCE AT OR NEAR THE GROUND SURFACE, SHOWED DOSE TO BE ROUGHLY A FUNCTION OF THE ANGLE WHICH THE SOURCE-DETECTOR LINE MADE WITH THE HORIZONTAL. CORRECTION FACTORS AS FUNCTIONS OF THIS ANGLE WERE COMPUTED. AVERAGE DOSES AT TH REE FEET HEIGHT FOR ALL EIGHT TEST SURFACES WERE EXTRAPOLATED OUT TO I NFINITE FIELD DOSES USING THESE ANGLE CORRECTION FACTORS AND INVERSE S QUARE CORRECTION FACTORS. THE RATIOS OF THESE INFINITE FIELD DOSES TO THEORETICAL UNCOLLIDED DOSES FROM A SMOOTH INFINITE PLANE SOURCE IN A N INFINITE AIR MEDIUM WERE COMPUTED. REDUCTIONS OF 20 TO 25 PERCENT W ERE FOUND FOR "BARE, SANDY SOIL" AND "TURF" SURFACES. "MACADAM" AND " SNOW" SURFACES SHOWED SMALLER REDUCTIONS AND "ASPHALT", "CONCRETE", "I CE", AND "GLASS" SHOW EXPERIMENTALLY EXTRAPOLATED DOSES TO BE VIRTUALL Y THE SAME AS THEORETICAL UNCOLLIDED DOSES.


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