Study on neutron imaging techniques and processings for developing quantitative neutron radiography

Four kinds of existing arrangements of neutron radiography techniques and a newly proposed arrangement were examined to evaluate the removing efficiency of the scattered neutron and gamma-ray contaminant. Techniques of dispersion, channel and umbra arrangement were evaluated to obtain quantitative neutron attenuation coefficient. A new combination technique of the neutron absorbing honeycomb collimator and the double X-ray films has verified that the relationship between the neutron transmittance and object thickness is fairly expressed by a single exponential curve in a transmission range from 1.0 to 0.01.