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One of the principal concerns of a physicist responsible for calibrating megavoltage radiotherapy equipment is the validity and stability of the 60Co exposure correction factor assigned to his ionization-chamber and electrometer system. It is the practice of the AAPM Radiological Physics Center (RPC) to perform an intercomparison between the RPC chamber and electrometer system and the chamber and electrometer in use at each of the various institutions visited by the RPC. The results of 202 such intercomparisons are reviewed to determine (1) the consistency in the assignment of exposure correction factors by a calibrating agency with itself and with other calibrating agencies, and (2) the dependence of the reliability of the exposure correction factors upon the type of field instrument and the time since calibration.
W F Hanson, and
W Grant, and
P Kennedy, and
J H Cundiff, and
W F Gagnon, and
L W Berkley, and
R J Shalek
September 1979,
Vital and health statistics. Series 21, Data from the National Vital Statistics System,
W F Hanson, and
W Grant, and
P Kennedy, and
J H Cundiff, and
W F Gagnon, and
L W Berkley, and
R J Shalek
January 1978,
Family planning perspectives,
W F Hanson, and
W Grant, and
P Kennedy, and
J H Cundiff, and
W F Gagnon, and
L W Berkley, and
R J Shalek
January 1980,
Ophthalmology,
W F Hanson, and
W Grant, and
P Kennedy, and
J H Cundiff, and
W F Gagnon, and
L W Berkley, and
R J Shalek
January 1981,
American journal of epidemiology,
W F Hanson, and
W Grant, and
P Kennedy, and
J H Cundiff, and
W F Gagnon, and
L W Berkley, and
R J Shalek
March 1982,
American journal of epidemiology,
W F Hanson, and
W Grant, and
P Kennedy, and
J H Cundiff, and
W F Gagnon, and
L W Berkley, and
R J Shalek
January 1985,
Sexually transmitted diseases,
W F Hanson, and
W Grant, and
P Kennedy, and
J H Cundiff, and
W F Gagnon, and
L W Berkley, and
R J Shalek
December 1977,
The Journal of infectious diseases,
W F Hanson, and
W Grant, and
P Kennedy, and
J H Cundiff, and
W F Gagnon, and
L W Berkley, and
R J Shalek
April 1980,
Vital and health statistics. Series 21, Data from the National Vital Statistics System,
W F Hanson, and
W Grant, and
P Kennedy, and
J H Cundiff, and
W F Gagnon, and
L W Berkley, and
R J Shalek
April 1969,
Nederlands tijdschrift voor geneeskunde,
W F Hanson, and
W Grant, and
P Kennedy, and
J H Cundiff, and
W F Gagnon, and
L W Berkley, and
R J Shalek
August 1970,
JAMA,
