Knowledge Of Neutron Spectrum Research Articles

BONNER CYLINDER SET FOR NEUTRON SPECTROSCOPY AT HIGH ENERGY ACCELERATORS.

At particle accelerators, the knowledge of neutron spectra is important for radiation protection to improve the accuracy of dose measurements, for activation and radiation damage studies. Classical Bonner sphere spectrometer is a common reliable tool for this kind of measurements. Here we present a new set of cylinders with TLD cards as a sensitive element to be used for neutron spectroscopy in a wide energy range for continuous and ultra-short pulse radiation. A simple layout, relatively small dimensions and weight, as well as implementation of common materials providing low construction costs make the set useful for spectroscopic purposes. The unfolding results for various simulated radiation scenarios are also presented.

Measurement of neutron spectra in the thermal column of the reactor of a power station

Knowledge of neutron spectra In nuclear reactors allows comparison of various theories of the slowing down of neutrons with experiment, and also allows carrying out reactor calculations which are based on actual neutron distributions therein. In this paper is described a neutron intensity monochtomator Intended for the measurement of neutron spectra in the energy interval 0 to 0.5 ev. Results are given for measurements for neutron spectra in the thermal column of the reactor of an atomic power station. Discontinuities in the neutron flux were discovered at neutron velocities of 600, 1000 and 1650 m/sec; an analysis is given of the causes of discontinuities of the neutron flux; an evaluation is made of the inelastic scattering cross section for neutrons in graphite. By the method of least squares, the temperature of the neutron gas was found, being equal to 354 ° K at a graphite temperature of 304 ° K.