Document Details


Title:
REPORT TO THE TEST DIRECTOR, OPERATION UPSHOT-KNOTHOLE, NEVADA PROVING GROUNDS, MARCH - JUNE 1953, PROJECT 4.7, BETA-GAMMA SKIN HAZARD IN THE POSTSHOT CONTAMINATED AREA
Author(s):
Subject Terms:
BETA PARTICLES; GAMMA RADIATION; SKIN; RADIATION DOSES; CONTAMINATION; UPSHOT OPERATION; UPSHOT-KNOTHOLE 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:
1953 Mar 31
Declassification Status:
Declassified
Document Pages:
0034
Accession Number:
NV0006226
Document Number(s):
WT746
OpenNet Entry Date:
1994 Aug 26
OpenNet Modified Date:
2003 Sep 18
Description/Abstract:
THEORETICAL CALCULATIONS FOR CERTAIN IDEALIZED GEOMETRIES HAVE INDICAT ED THAT IN A BOMB CONTAMINATED AREA THE BETA RADIATION DOSE-RATE SHOUL D FAR EXCEED THE GAMMA DOSE-RATE AT ALL POINTS LESS THAN 2 METERS ABOV E THE GROUND LEVEL. THIS CONCLUSION POSES AN AWKWARD RADIOLOGICAL SAF ETY PROBLEM BECAUSE: A. EXISTING PERSONNEL MONITORING DEVICES MEASURE GAMMA DOSE ONLY. B. MAXIMUM PERMISSIBLE DOSES, AND RADIATION HAZARD C ONTROL POLICIES IN GENERAL, IN FIELD EFFORTS, ARE BASED SOLELY UPON TH E MEASUREMENT OF GAMMA DOSE. IN THE PRESENT EXPERIMENT THE BETA AND G AMMA RADIATION DOSE THAT WOULD BE RECEIVED BY THE SENSITIVE LAYER OF T HE SKIN WAS MEASURED IN SEVERAL CONTAMINATED AREAS IN FRENCHMAN FLAT A ND YUCCA FLAT. SPECIALLY CONSTRUCTED, THIN-WALLED ION CHAMBERS WERE U SED WHICH WERE SENSITIVE TO GAMMA RAYS AND TO ALL BETA PARTICLES CONSI DERED TO BE A HAZARD. IT WAS FOUND THAT, ALTHOUGH THERE IS, INDEED, A N INCREASE IN RADIATION HAZARD AT POINTS NEAR THE GROUND, THE VERY LAR GE BETA DOSE TO BE EXPECTED FROM THEORY DOES NOT ACTUALLY OCCUR IN THE FIELD. BECAUSE OF THE PARTICULATE NATURE OF THE CONTAMINATION THE CO NCLUSIONS REACHED DO NOT APPLY FOR ELEVATIONS OF LESS THAN 1 CM.


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