THE APPLICATION OF LONG ESR SENSOR RODS FOR NEUTRON AND GAMMA DOSIMETRY OF THE 'WEAK' IN-REACTOR IRRADIATION OF THE HTGR FUEL

摘要

In order to measure the general spatial distribution of the thermal neutron fluence during the so called "weak" irradiation (less than 10~(-17) n/m~2) of HTGR nuclear fuel for subsequent high temperature tests including fission products release, we apply local (0.3 cm rings) and distributed (long rods up to 65 cm) accumulative detectors of neutrons and gamma with results' reading by the electron spin resonance method (ESR-sensors). Sensors materials are: silicate ceramic (glass) containing B_2O_3 (neutron sensor) and quartz with Al_2O_3 addition (gamma sensor). The new possibilities of nontraditional ESR-sensors, a new type of nuclear radiation detectors are discussed.