Active Neutron Source¶
Documents about the source and the capsule [[http://annie-docdb.fnal.gov:8080/cgi-bin/ShowDocument?docid=286]]
Radiological Work Permit (RWP [[http://annie-docdb.fnal.gov:8080/cgi-bin/ShowDocument?docid=301]]Some basic rules about the source:
- It cannot be removed from the 33” long acrylic rod.
- It cannot get wet.
- It can’t go in the tank.
- We need to get it in the morning and return it before the end of the work day.
The most basic plan is to build a 'cup' out of scintillator (inorganic would be more dense) that has a PMT coupled to the base of the cup, and the source can slide into the top. We would need a way to support this assembly outside the tank in various positions.
Putting the source inside the tank is very difficult for a number of reasons. Light-tightness is a major one, and the red-tape of putting the source in a functionally inaccessible place. A solution that has been proposed and has received support would be to make another lid that would have a PVC pipe descending down into the water, making a dry-well accessible from the top. Due to the buoyancy, the diameter of the active source would have to be minimized.