Biomaterial Database

Investigation of neutron scattering for a multisphere spectrometer. 1990

R K Sun

Occupational Health Division, Lawrence Berkeley Laboratory, University of California, Berkeley 94720.

Count rates were measured as a function of distance from a planar concrete reflector for a set of eight Bonner-sphere detectors and four isotopic neutron sources. These data can be used to determine the contributions of scattered neutrons to the response of moderated detectors used in environments bounded by concrete. A model based on "images" of the original source can be developed to produce an equation that describes the data well, if the strengths of the image sources can be treated as variable parameters. Values of the parameters appearing in the equations are given based on least-squares analysis of the experimental results.

UI	MeSH Term	Description	Entries
D009502	Neutrons	Electrically neutral elementary particles found in all atomic nuclei except light hydrogen; the mass is equal to that of the proton and electron combined and they are unstable when isolated from the nucleus, undergoing beta decay. Slow, thermal, epithermal, and fast neutrons refer to the energy levels with which the neutrons are ejected from heavier nuclei during their decay.	Neutron
D002138	Calibration	Determination, by measurement or comparison with a standard, of the correct value of each scale reading on a meter or other measuring instrument; or determination of the settings of a control device that correspond to particular values of voltage, current, frequency or other output.	Calibrations
D012542	Scattering, Radiation	The diversion of RADIATION (thermal, electromagnetic, or nuclear) from its original path as a result of interactions or collisions with atoms, molecules, or larger particles in the atmosphere or other media. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)	Radiation Scattering,Radiation Scatterings,Scatterings, Radiation
D013057	Spectrum Analysis	The measurement of the amplitude of the components of a complex waveform throughout the frequency range of the waveform. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)	Spectroscopy,Analysis, Spectrum,Spectrometry