Determination of 68Ge-trace activities in 68Ga eluates from a 68Ge/68Ga generator using X-ray spectrometry with a gas proportional counter

The aim of this study was to introduce a new concept for measuring the remaining radioactivity in the
⁶⁸
Ga eluate or in the final radiopharmaceutical product.
⁶⁸
Ge decays to
⁶⁸
Ga through electron capture (EC, 100%). Using the 9.24 keV K X-rays of
⁶⁸
Ga following the EC of
⁶⁸
Ge the remaining
⁶⁸
Ge radioactivity in the
⁶⁸
Ga eluate can be measured with a gas proportional counter.