Microdosimetric spectra measurements of JANUS neutrons

Conference · Tue Jan 01 04:00:00 EST 1985

OSTI ID:5546228

Marshall, I R; Williamson, F S

Neutron radiation from the JANUS reactor at Argonne National Laboratory is being used with increasing frequency for major biological experiments. The fast neutron spectrum has a Kerma-weighted mean energy of 0.8 MeV and low gamma-ray contamination. In 1984 the JANUS fission converter plate of highly enriched uranium was replaced by one made of low-enriched uranium. We recorded microdosimetric spectra at several different positions in the high-flux irradiation room of JANUS before the change of the converter plate. Each set of measurements consisted of spectra taken at three different site diameters (0.5, 1.0, and 5.0 ..mu..m) and in both ''attenuator up'' and ''attenuator down'' configurations. At two conventional dosimetry reference positions, two sets of measurements were recorded. At three biological reference positions, measurements simulating several biological irradiation conditions, were taken. The dose rate at each position was estimated and compared with dose rates obtained previously by conventional dosimetry. Comparison of the different measurements showed no major change in spectra as a function of position or irradiation condition. First results from similar sets of measurements recorded after the installment of the new converter plate indicate no major change in the spectra. 11 refs., 4 figs., 5 tabs.

• Research Organization: Argonne National Lab., IL (USA)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 5546228
• Report Number(s): CONF-850506-4; ON: DE85012108
• Country of Publication: United States
• Language: English

Related Subjects

61 RADIATION PROTECTION AND DOSIMETRY
655003* -- Medical Physics-- Dosimetry
DATA
DOSE RATES
DOSIMETRY
ENRICHED URANIUM REACTORS
EXPERIMENTAL DATA
INFORMATION
JANUS REACTOR
MICRODOSIMETRY
NEUTRON DOSIMETRY
NEUTRON SPECTRA
NUMERICAL DATA
REACTORS
RESEARCH AND TEST REACTORS
RESEARCH REACTORS
SPECTRA
TANK TYPE REACTORS
THERMAL REACTORS
WATER COOLED REACTORS
WATER MODERATED REACTORS