RT Journal Article
SR Electronic
T1 Dose Calibrator Performance and Quality Control
JF Journal of Nuclear Medicine Technology
JO J. Nucl. Med. Technol.
FD Society of Nuclear Medicine
SP 35
OP 40
VO 5
IS 1
A1 Kowalsky, Richard J.
A1 Johnston, R. Eugene
A1 Chan, Francis H.
YR 1977
UL http://tech.snmjournals.org/content/5/1/35.abstract
AB Two different dose calibrators were studied and their performance measured using the following tests: (A) linearity of response over all activity ranges, (B) accuracy when measuring some commonly used radionuclides, (C) the effect of container configuration on the accuracy of measurement, and (D) daily and long-term stability of the instrument. For each instrument tested, a good linear response was observed for activity measurements below 100 mCi, but there was evidence of nonlinearity at higher activity levels. The accuracy of each instrument was checked using radionuclide standards from two different sources. The measurements indicated a significant difference between standards that was not possible to resolve. Additionally, assessment of accuracy for a dose calibrator with any standard is difficult unless the manufacturer’s calibration procedure is known. The effect of container configuration and photon energy on the accuracy of measuring 99mTc, 131I, and 125I indicated that large correction factors may be necessary when making measurements of 125I. The measurement of a long-lived standard such as radium, cross calibrated for several radionuclide settings, is an effective means for assurring instrument stability and quality control on a daily and long-term basis.