What has to be determine before using speleothem for paleoenvironmental luminescence measurements?

Question

What has to be determine before using speleothem for paleoenvironmental luminescence measurements?

Answer 1

Surely the answer is obvious - isn't it?

Except, of course, on a Wednesday, when the moon is in its third quarter and the wind is from the East.

Answer 2

If the item under observation is organic or not.

Organic (especially humans) have biophotons which would interfere with luminescense mesurements.

Whereas most heat in the lthosphere is infra red coming from the heat trapped within the earth's core.