HOTSPUR: Neutron Induced gamma Rays Emitted by DT Neutron Pulsed Sphere - Detector Calibration

摘要

A series of calibration experiments has been done to characterize an NE-213 liquid scintillator detector of photons ranging up to approx.7 MeV. Calibrated sources of sup 24 Na, sup 22 Na, sup 60 Co, and sup 137 Cs were used to infer the conversion factors as a function of electron energy, and detector efficiencies. In the latter effort, comparisons were made of the measured electron recoil spectra with their calculated counterpart. The code SANDYL was used and its results were modified slightly by folding in a normal distribution to account for the anticipated broadening due to variations in the location of light pulses within the scintillator. The calculated spectra were 0 to 10% above the experimental data. Higher energy gamma rays were generated by a Pu-Be source, which generated the 4.439-MeV line from sup 12 C*, and the sup 16 O(n,n') sup 16 O* reaction, which generated among others the 6.130, 6.919, and 7.117 lines. We observed a marked nonlinearity of light pulse amplitude with electron energy at higher energies. Linearity was confirmed at and below 2.75 MeV, with an estimated threshold at 15 keV. The nonlinearity at higher energy will complicate the analysis. (ERA citation 12:001368)