> Usually you want to avoid anything that blocks gammas as much as possible because you need every one you can get.

Agreed- my first order assumption run with that one was that any shielding would be light weight.

> they tend interact multiple times and deposit their energy in multiple places along a line via a ton of different physical interactions.

Huh. Okay, although all of the form gamma energy packet interacts with doped crystal and scintillates I'd assume. I can see that you've got a bit more going on here in the detection instrumentation.

Fast enough to catch everything or throwing in calibrations for deadtime?

Hmm, anyhow, seems like much fun was had in the lab working on the dissertation, good job :-)

My time was almost always pressed to get more fieldwork done and never quite got the amount of playing about time I wanted :/