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This technique is used to determine element concentrations in process streams of mineral concentrators.
Probes containing radioisotopes and a detector are immersed directly into slurry streams.
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TNC occurs immediately after a low-energy neutron is absorbed by a nucleus, NIS takes place instantly when a fast neutron collides with a nucleus.
Most commercial analysers use californium-252 neutron sources together with sodium iodide detectors and are mainly sensitive to TNC reactions.The gamma ray interactions are atomic number dependant, and the ash is higher in atomic number than the coal combustible matter.Also the energy spectrum of gamma rays which have been inelastically scattered from the coal can be measured (Compton profile analysis) to indicate the ash content.The continuous analysis and rapid response of nuclear techniques, many involving radioisotopes, mean that reliable flow and analytic data can be constantly available.This results in reduced costs with increased product quality.Other use Am-Be-241 sources and bismuth germanate detectors, which register both TNC and NIS.