Response of six neutron survey meters in mixed fields of fast and thermal neutrons.

Calibration neutron fields have been developed at KAERI (Korea Atomic Energy Research Institute) to study the responses of commonly used neutron survey meters in the presence of fast neutrons of energy around 10 MeV. The neutron fields were produced by using neutrons from the (241)Am-Be sources held in a graphite pile and a DT neutron generator. The spectral details and the ambient dose equivalent rates of the calibration fields were established, and the responses of six neutron survey meters were evaluated. Four single-moderator-based survey meters exhibited an under-responses ranging from ∼9 to 55 %. DINEUTRUN, commonly used in fields around nuclear reactors, exhibited an over-response by a factor of three in the thermal neutron field and an under-response of ∼85 % in the mixed fields. REM-500 (tissue-equivalent proportional counter) exhibited a response close to 1.0 in the fast neutron fields and an under-response of ∼50 % in the thermal neutron field.

[1]  Ronald A. Sinton,et al.  Overview and Latest Developments in Photoconductance Lifetime Measurements in Silicon , 2013 .

[2]  J. I. Lee,et al.  Response of several neutron measuring devices under the fractional change of thermal and fast neutrons , 2010 .

[3]  Jan Palczewski,et al.  Monte Carlo Simulation , 2008, Encyclopedia of GIS.

[4]  T. Radon,et al.  Test of the rem-counter WENDI-II from Eberline in different energy-dispersed neutron fields , 2004 .

[5]  V. Mareš,et al.  Response functions of the Andersson–Braun and extended range rem counters for neutron energies from thermal to 10 GeV , 2002 .

[6]  Marcel Reginatto,et al.  Spectrum unfolding, sensitivity analysis and propagation of uncertainties with the maximum entropy deconvolution code MAXED , 2002 .

[7]  B Wiegel,et al.  NEMUS—the PTB Neutron Multisphere Spectrometer: Bonner spheres and more , 2002 .

[8]  R. Olsher,et al.  WENDI: an improved neutron rem meter. , 2000, Health physics.

[9]  P. Goldhagen,et al.  MAXED, a computer code for maximum entropy deconvolution of multisphere neutron spectrometer data. , 1999, Health physics.

[10]  A. Ferrari,et al.  The Extended Range Neutron Rem Counter LINUS: Overview and Latest Developments , 1998 .

[11]  B. Siebert,et al.  The Neutron Fluence and H*(10) Response of the New LB 6411 REM Counter , 1997 .

[12]  J. C. Liu,et al.  Measurements of Neutron Spectra at the Stanford Linear Accelerator Center , 1997 .

[13]  A. Waker,et al.  Multisphere spectrometry and analysis of TEPC and REM meter results around a heavy water moderated reactor , 1995 .

[14]  H. Hsu,et al.  A new Bonner-sphere set for high energy neutron measurements: Monte Carlo simulation , 1994 .

[15]  V. Mareš,et al.  Calculation of the Neutron Ambient Dose Equivalent on the Basis of the ICRP Revised Quality Factors , 1992 .