A PMT is a Photo Multiplier Tube.
http://www.eetasia.com/STATIC/PDF/20090 ... S=DOWNLOAD
If that link doesn't work you can get to it through this link:
http://www.eetasia.com/ART_8800565064_4 ... ICLE_ALERT
Counting Neutrons with a PMT
Counting Neutrons with a PMT
Engineering is the art of making what you want from what you can get at a profit.