PERFORMANCE OF MULTISPHERE SPECTROMETRY SYSTEMS

A TLD-based multisphere spectrometer has been constructed to measure neutron spectra under high fluence-rate conditions. The multisphere system uses paircd TLD-600 and TLD-700 thermoluminescence detectors. Spectral measurements made with this system are compared with measurements made with a 6 Lil(Eu) scintillator-based Bonner sphere spectrometer. The system was used to measure the neutron spectrum of the Georgia Tech Research Reactor Bio-Medical Facility under high neutron fluence rates. The scintillator-based system was used at low neutron and gamma fluence rates. A comparison of this unfolded spcctrum is made with an MCNP codc calculation performed using a simplified representation of the reactor and the bcam facility.

[1]  H. Vega-Carrillo.  Neutron field characterization in the vicinity of a PET cyclotron , 1995 .

[2]  K. A. Klee.  Optimization of an Epi-thermal neutron beam and beam dosimetry for boron neutron capture therapy at the Georgia Tech Research Reactor , 1994 .

[3]  C. Eisenhauer.  Two-Component Analytical Model to Calculate Room-Return Correction for Calibration of Neutron Instruments , 1992 .

[4]  J. Smith.  Neutron Multiplication in Beryllium , 1992 .

[5]  James E. Keith,et al.  Neutron spectrum and dose-equivalent in shuttle flights during solar maximum , 1992 .

[6]  J. Mcdonald,et al.  Calculations of Anisotropy Factors and Dose Equivalents for Unmoderated 252Cf Sources , 1990 .

[7]  C. Eisenhauer.  Review of Scattering Corrections for Calibration of Neutron Instruments , 1989 .

[8]  R. B. Schwartz,et al.  Effect of air scatter on calibration of instruments for detecting neutrons , 1987 .

[9]  N. Hertel,et al.  The response of bonner spheres to neutrons from thermal energies to 17.3 MeV , 1985 .

[10]  W. Miller,et al.  Additional experimental tests of the Bonner sphere neutron spectrometer , 1985 .

[11]  R. B. Schwartz,et al.  Calibration Techniques for Neutron Personal Dosimetry , 1985 .

[12]  M. Awschalom,et al.  Applications of Bonner Sphere Detectors in Neutron Field Dosimetry , 1985 .

[13]  T. Johnson,et al.  Modifications to recursion unfolding algorithms to find more appropriate neutron spectra. , 1984, Health physics.

[14]  J. B. Hunt.  The Calibration of Neutron Sensitive Spherical Devices , 1984 .

[15]  F. J. Muckenthaler.  Integral measurements of neutron and gamma-ray leakage fluxes from the Little Boy replica , 1984 .

[16]  R. C. McCall,et al.  Transport of Accelerator Produced Neutrons in a Concrete Room , 1978, IEEE Transactions on Nuclear Science.

[17]  J. Doroshenko,et al.  New Methods for Measuring Neutron Spectra with Energy from 0.4 eV to 10 MeV by Track and Activation Detectors , 1977 .

[18]  R. V. Griffith,et al.  AMES collaborative study of cosmic ray neutrons , 1976 .

[19]  E. Axton.  The effective centre of a moderating sphere when used as an instrument for fast neutron flux measurement , 1972 .

[20]  P. R. Bevington,et al.  Data Reduction and Error Analysis for the Physical Sciences , 1969 .

[21]  Ronald I. Ewing,et al.  A new type of neutron spectrometer , 1960 .