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Significance of Radiocontaminants in ¹²³I for Dosimetry and Scintillation Camera Imaging

Medi-Physics, Inc., Emeryville, California

Correspondence: For reprints contact: G. A. Baker, Medi-Physics, Inc., 5801 Christie Ave., Emeryville, CA 94608.

ABSTRACT

Estimates of absorbed radiation dose and qualitative assessments of image resolution were compared for pure ¹³¹ and for ¹²³I produced by the ¹²²Te(d,n), ¹²⁴Te(p,2n), and ¹²⁷I(p,5n) ¹²³Xe reactions. A substantial reduction in radiation dose is indicated when ¹²³I replaces ¹³¹I, in spite of the radiocontaminants typically present 30–35 hr after the production of ¹²³I by any of these methods. Only a marginal further reduction in radiation dose was noted with use of the most "pure" as opposed to the least "pure" ¹²³I Comparable scintillation camera resolution was obtained for all ¹²³I preparations at 30–35 hr after bombardment when the medium energy and pinhole collimators were used. However, the radiocontaminants in the ¹²³I produced from tellurium affected image resolution when the low-energy collimator was used.

FOOTNOTES

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