Dr. Photon:
Residue after baking sodium iodide crystal
Dr. Photon:
Sodium iodide scintillator crystal baked at 250F for two hours
Dr. Photon:
PRI 111 NaI crystal disassembled
Dr. Photon:
Inside PRI 111 barrel (where scintillator crystal and PMT go)
Dr. Photon:
PRI 111 circuit board, top
Dr. Photon:
PRI 111 circuit board, back
Dr. Photon:
PRI 111 sodium iodide(thallium) crystal in mount. Yellowed.
Dr. Photon:
PRI 111 detector, bag removed
Dr. Photon:
PRI 111 detector asembly, foam shock ring removed
Dr. Photon:
PRI 111 detector, bag removed
Dr. Photon:
PRI 111 detector as received
Dr. Photon:
PRI 111 new battery pack test fitting 2
Dr. Photon:
PRI 111 new battery pack testv fitting 1
Dr. Photon:
New high voltage battery pack for PRI 111
Dr. Photon:
Building PRI 111 new high voltage battery pack
Dr. Photon:
PRI 111 new battery pack:4x D batt, 6x AAA batt, and 12x 9v batt
Dr. Photon:
PRI 111 original battery pack 8
Dr. Photon:
PRI 111 original battery pack 6
Dr. Photon:
PRI 111 original battery pack 7
Dr. Photon:
PRI 111 original battery pack 5
Dr. Photon:
PRI 111 original battery pack 4
Dr. Photon:
PRI 111 original battery pack 3
Dr. Photon:
PRI 111 orig battery pack 2
Dr. Photon:
PRI 111 new battery pack wiring
Dr. Photon:
PRI 111 original battery pack 1
Dr. Photon:
PRI 111 12x 9v battery pack
Dr. Photon:
PRI 111 new battery pack wiring 1
Dr. Photon:
Complete PRI 111 battery pack
Dr. Photon:
40 9-volt batteries