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What types of rays does the nuclear weigher used to measure the weight?

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What types of rays does the nuclear weigher used to measure the weight?

(a) Infrared rays

(b) Ultraviolet rays

(c) Gamma rays

(d) X-ray waves

The question was asked during a job interview.

I'm obligated to ask this question of Coal Weighing Methods topic in division Steam Power Plant of Energy Engineering

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Right answer is (c) Gamma rays

For explanation: Nuclear weighing system operates on gamma ray, Works on gamma rays absorption principle. A radio-active source located in the source head emits gamma rays which pass through the material on the conveyor to the detector.

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