A scintillometer measures ionizing radiation. The sensor is a crystal that fluoresces when ionizing radiation hits it. A sensitive photocell measures the light from the crystal. The photocell is attached to an electronic amplifier and possibly other electronic equipment.
Scintillometers are the most sensitive known radiation detectors.
... Demographics
As of the census of 2000, there are 14,078 people, 4,578 households, and 3,731 families residing in the town. The population density is 1,322.5/km² ...