I have access to several types of used Nuclear Medicine gamma cameras. I've
often entertained the idea to convert one for astro-gamma imaging. I'm not
much of an astronomer but am somewhat knowledgeable with gamma cameras. The
main problem that has always stopped me from pursuing this idea, is the fact
that the large sodium-iodine crystal can fracture if there's an ambient
temperature change of 6 degrees F in 1 hour. Outdoor temperature
fluctuations ... (well I'm sure you understand).
I apologize if this is not the correct NG for my question. Perhaps I can be
directed to a more appropriate one? Thank you.

Cordially,
west