A. Cathode ray tube
B. Geiger-Muller counter
C. Mass spectrometer
D. X-ray tube
Correct Answer: Option B
B. Geiger-Muller counter
A. Cathode ray tube
B. Geiger-Muller counter
C. Mass spectrometer
D. X-ray tube
Correct Answer: Option B
B. Geiger-Muller counter
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