Method for accurate measurement of attenuation of radiation e.g. photon radiation to measure thickness of paper in metallurgical mill, involves calculating mean attenuation value by successive calculation of specified algebraic equation

摘要

The method involves penetrating photon or particle radiation radiated from a collimated radiation source (1) into a material (4) to be examined and on a detector (2) that count arriving photons and/or particles. A number photons and/or particles counted by the detector for a short time interval is detected by a data acquisition and processing unit (3). Frequency distribution of counts is stored in a data field (F) by the processing unit. A mean attenuation value (A) is calculated by the processing unit by successive calculation of a specified algebraic equation. An independent claim is also included for a radiography arrangement for accurate measurement of attenuation of radiation by varying material distributions, comprising a detector.