Document Details
Title:
OPERATION PLUMBBOB, NEVADA TEST SITE, MAY - OCTOBER 1957, PROJECT 2.10, INITIAL NEUTRON AND GAMMA AIR - EARTH INTERFACE MEASUREMENTS
Author(s):
Subject Terms:
PLUMBBOB OPERATION; GAMMA RADIATION; NEUTRONS; ONSITE
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:
1957 May 31
Declassification Status:
Unknown
Document Pages:
0068
Accession Number:
NV0006225
Document Number(s):
WT1419
OpenNet Entry Date:
1994 Aug 26
OpenNet Modified Date:
2003 Sep 18
Description/Abstract:
MEASUREMENTS OF THE TOTAL GAMMA DOSE, GAMMA DOSE RATE, NEUTRON FLUX, A ND NEUTRON DOSE WERE MADE AT THE SURFACE AND AT HEIGHTS UP TO 950 FEET TO DETERMINE THE EFFECT OF THE AIR-GROUND INTERFACE ON INITIAL NUCLEA R RADIATION. MEASUREMENTS OF TOTAL GAMMA DOSE AND NEUTRON FLUX WERE M ADE WITH DOSIMETERS FASTENED TO TOWERS 500 FEET HIGH AND TO THE MOORIN G CABLES OF CAPTIVE BALLOONS 950 FEET HIGH. TOTAL GAMMA MEASUREMENTS WERE MADE WITH THREE TYPES OF FILM BADGES, TWO TYPES OF PHOSPHATE GLAS S DOSIMETERS, QUARTZ-FIBER DOSIMETERS, AND CHEMICAL DOSIMETERS. NEUTR ON-FLUX MEASUREMENTS WERE MADE WITH SULFUR PELLETS AND WITH NUCLEAR TR ACK EMULSIONS. NEUTRON-DOSE MEASUREMENTS WERE MADE WITH CHEMICAL DOSI METERS. MEASUREMENTS OF GAMMA DOSE RATE WERE MADE WITH AIR-FILLED, SA TURATED, ION-CHAMBER DETECTORS CARRIED BY CAPTIVE BALLOONS WITH SIGNAL S CARRIED BY MINIATURE COAXIAL CABLE TO GROUND STATIONS AND RECORDED O N MAGNETIC TAPE. IT WAS FOUND THAT TOTAL GAMMA DOSE INCREASED WITH HE IGHT TO A VALUE, AT 400 FEET, 30 PERCENT GREATER THAN GROUND MEASUREME NTS. THERE WAS NO FURTHER INCREASE UP TO 950 FEET. THE EFFECT WAS TH E SAME AT ALL STATIONS FROM 1,500 TO 3,500 YARDS HORIZONTAL DISTANCE F ROM BURST POINT. THERE WAS NO CHANGE IN THE RATIO OF GAMMA DOSE RATES AT THE BALLOON STATIONS COMPARED TO DOSE RATES AT GROUND STATIONS OVE R THE FIRST 5-SECOND INTERVAL FOR WHICH RECORDS WERE OBTAINED. SULFUR NEUTRON-FLUX MEASUREMENTS INCREASED WITH HEIGHT TO A VALUE OF 30 PERC ENT GREATER THAN GROUND MEASUREMENTS AT 500 FEET. NO CHANGE WAS OBSER VED FROM 500 FEET TO 950 FEET. NEUTRON REP-DOSE MEASUREMENTS WERE NOT CONCLUSIVE.