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Accuracy of Well Ionization Chamber Isotope Calibrators

University of Colorado Medical Center and Veterans Administration Hospital, Denver, Colorado

Correspondence: For reprints contact: William R. Hendee, University of Colorado Medical Center, 4200 E. Ninth Avenue, Denver, Colo. 80220.

ABSTRACT

Activities of calibrated samples of ^99mTc, ¹³¹I, and ¹⁹⁷Hg were measured in well ionization chamber isotope calibrators in use in 14 clinical nuclear medicine facilities. These measurements yielded estimated activities which varied significantly (frequently, 15–25%) from the calibrated activities of the samples. For the isotope calibrators examined in this study, calibration factors have been supplied to correct indicated activities to true activities. Extension of this service to nuclear medicine facilities outside of Denver is planned.