Which of the following is a safety device that detects ionizing radiation?

Gieger Counter is the correct answer.

Explanation:

Geiger counter is an instrument used for measuring the ionising radiations such as beta and alpha particle or gamma rays. It is a  hand held radiation instrument and can also be used as bench instrument. Its operating principle was discovered in 1908, Geiger-Muller tube was developed in 1928. It is very popular instrument due to good sensing detector and element and low cost. The sensor is a tube that emits electronic signal when the radiation is present and the counts displayed is the counts per second. The radiation dose is displayed in a unit sievert. The reading of the signal can be digital or analogue.

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