NEUTRON DOSE CALIBRATION OF INDIUM PERSONNEL DOSIMETERS FOR PROMPT-CRITICAL METAL BURSTS

Technical Report · Thu Mar 01 00:00:00 EST 1956

DOI:https://doi.org/10.2172/4158818· OSTI ID:4158818

Wachter, J W; Emerson, L C

Thermoplastic personnel security badges containing a 0.9 gm indium foil were mounted on tissue-equivalent phantoms placed 1 to 4 m from the unmoderated, untamped, Oralloy reactor, Godiva, and subjected to radiation from prompt- critical bursts of about 10/sup 16/ fissions. Badge activities immediately after exposure ranged from 50 mr/hr to 1 mr/hr for exposures made out-of-doors, and 150 to 10 mr/hr, respectively, for exposures made indoors. Curves are presented which relate, for given burst intensity, the tothl neutron and prompt gamma dose to badge activity as measured with a beta-gamma survey meter. Using these curves, a grouping of irradiated persons is possible in which those having had less than an LD/sub 10/ and those having had more than an LD/sub 100/ can be separated from those whose lethal probability is high but uncertain. Approximately 1/100 of an LD/sub 100/ dose could be detected 1 hour after a burst. For each phantom, the activity difference between badges facing toward and facing away from the reactor correlated linearly with dose, independent of distance and burst intensity, suggesting that the dose delivered to persons wearing an indium- loaded belt could be determined to an LE(0.05) of plus or minus 30 rem for doses greater than 50 rem. (auth)

• Research Organization: Union Carbide Nuclear Co. Y-12 Plant, Oak Ridge, Tenn.
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA), Nuclear Criticality Safety Program (NCSP)
• DOE Contract Number: W-7405-ENG-26
• NSA Number: NSA-14-018057
• OSTI ID: 4158818
• Report Number(s): Y-1092(Del.)
• Country of Publication: United States
• Language: English

Related Subjects

AIR
BETA PARTICLES
DETECTION
DIAGRAMS
DOSEMETERS
FOILS
GAMMA RADIATION
HEALTH AND SAFETY
INDIUM
IRRADIATION
LETHAL DOSE
MAN
MEASURED VALUES
MOCKUP
MONITORING
NEUTRON DETECTION
Nuclear Criticality Safety Program (NCSP)
NUCLEAR EXPLOSIONS
PERSONNEL
RADIATION DETECTORS
RADIATION DOSES
RESEARCH REACTORS
TISSUES