High-precisionγ-ray spectroscopy of the cardiac PET imaging isotopeRb82and its impact on dosimetry

Abstract

82 Rb is a positron emitting isotope used in cardiac PET imaging which has been reported to deliver a significantly lower effective radiation dose than analogous imaging isotopes like 201 Tl and 99m Tc sestamibi. High quality β-decay data are essential to accurately appraise the total dose received by the patients. A source of 82 Sr was produced at the Brookhaven Linac Isotope Producer (BLIP) then transported to Argonne National Laboratory and studied with the Gammasphere facility. Significant revisions have been made to the level scheme of 82 Kr including 12 new levels, 50 new γ-ray transitions and the determination of many new spin assignments through angular correlations. These new high quality data allow a precise reappraisal of the β-decay strength function, and thus the consequent dose received by patients.

Positron Emission Intensity in the Decay of 86gY for Use in Dosimetry Studies

“…A new detailed γ-ray spectroscopic measurement was performed on the decay scheme of the standard positron emitter 82 Rb and, therefrom, the total positron emission probability was deduced [ 9 ], which agreed well with the accepted value. Regarding the non-standard positron emitters, new measurements on the direct characterization of the positron emission intensity were carried out for 45 Ti (t 1/2 = 3.1 h), 64 Cu (t 1/2 = 12.7 h), 76 Br (t 1/2 = 16.2 h), 120 I (t 1/2 = 1.3 h), and 124 I (t 1/2 = 4.2 d) [ 10 , 11 , 12 ].…”