P3H4O1T1O1D2E1T1E1C3T1O1R1S1
22 points
PHOTODETECTORS is validvalid
PHOTODETECTOR,
PHOTODETECTOR, any of various devices for detecting and measuring the intensity of radiant energy through photoelectric action
PHOTODETECTOR,
PHOTODETECTOR, any of various devices for detecting and measuring the intensity of radiant energy through photoelectric action