There are 2 kinds of Tech. Tom says 24-30 for one(Technetium 99 Tc
Sestamibi) and 48 hours for other(Technetium-99m). I'd go for the 48 if
you aren't sure which. That's why I now have a Hale at home and at work!
Maybe we should just carry them with us! Sincerely, Pat