A sensor is a device that measures or detects a physical quantity and converts it into a signal which can be read by an observer or by an instrument.
A radiation detector, or geiger counter, is a sensor that measures or detects atomic decay.
A sensor is a device that measures or detects a physical quantity and converts it into a signal which can be read by an observer or by an instrument.
A radiation detector, or geiger counter, is a sensor that measures or detects atomic decay.