PT  - JOURNAL ARTICLE
AU  - Hughes, Judy A.
AU  - Williams, Craig C.
AU  - Thomas, Stephen R.
AU  - Maxon, Harry R.
AU  - Basiewicz, Rosemary H.
AU  - Love, William J.
TI  - Potential Errors Caused by Variable Radionuclidic Purity of Iodine-123
DP  - 1979 Sep 01
TA  - Journal of Nuclear Medicine Technology
PG  - 167--170
VI  - 7
IP  - 3
4099  - http://tech.snmjournals.org/content/7/3/167.short
4100  - http://tech.snmjournals.org/content/7/3/167.full
SO  - J. Nucl. Med. Technol.1979 Sep 01; 7
AB  - The commercial accelerator production of iodine-123 in the United States has changedfrom the Te-122 (d,n) I-123 reaction to the Te-124 (p,2n) I-123 reaction—and a greater amount of I-124 contamination results. This impurity causes only slight elevation in thyroid uptake value when counted 24 hr after calibration time of the capsule, but a significant elevation in uptake value 48 hr after calibration time (when I-123 is administered 24 hr after calibration time). There is no image degradation on 24- and 48-hr scintigraphs obtained with a pinhole collimator. A significant time-dependent change in potentiometer settings on dose calibrators is required to assay the capsules.