Once again, this is all about the time-activity curves. Regions of interest are drawn around the stomach and the curves plotted from this, with the patient lying underneath the camera for 2 hours - can you imagine!
The t1/2 for solids is 1.5 hours and for liquids 1/2 an hour.
Or at RMH, the numbers used were:
SOLID - T1/2 <110 mins with normal <55% remaining at 90mins.
LIQUID - T1/2 <40 mins (12-65mins)
The radionuclides are part of food - typically you eat omellette or mashed potatoes flavoured with Tc-tin colloid and orange juice flavoured with In-DTPA.
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