Energy and rate dependence of diagnostic x-ray exposure meters.
Variations in x-ray exposure measurements among a variety of contemporary diagnostic exposure meters are investigated. Variations may result from systematic errors due to calibration, beam-quality dependence and exposure-rate dependence. It is concluded that the majority of general purpose diagnostic meters will agree to within 10% of each other if exposure rates are below 1.3 mC kg-1S-1 of air (5 R s-1) and beam qualities are typical for general purpose radiology, excluding mammography. For exposure rates comparable to those in barium enema radiography the variations can range up to 25% or more. Variations up to 40% were observed among general purpose exposure meters at mammographic beam qualities. In the mammographic range, mammographic (thin window) exposure meters varied by no more than 2%.
Wagner
L K
LK
University of Texas Medical School, Houston 77030.
Cerra
F
F
Conway
B
B
Fewell
T R
TR
Ohlhaber
T R
TR
D055592:Biophysical Phenomena; D001703:Biophysics; D005069:Evaluation Studies as Topic; D006801:Humans; D011829:Radiation Dosage; D011859:Radiography; D011874:Radiometry / Q000295:instrumentation*