Energy and rate dependence of diagnostic x-ray exposure meters

摘要: Variations in x-ray exposure measurements among a variety of contemporary diagnostic meters are investigated. may result from systematic errors due to calibration, beam-quality dependence and exposure-rate dependence. It is concluded that the majority general purpose will agree within 10% each other if rates below 1.3 mC kg-1S-1 air (5 R s-1) beam qualities typical for radiology, excluding mammography. For comparable those barium enema radiography variations can range up 25% or more. 40% were observed at mammographic qualities. In range, (thin window) varied by no more than 2%.