Physics, 23.08.2019 12:30 mathamaticlly

Ateacher used a geiger-muller(gm)tube to measure the background radiation in her laboratory.
she rest the counter to zero, waited one minute and then took the count reading. she then repeated the same procedure two more times.
the results are as follows,
count after one minute-15
-24
-18
the readings here are correct.
why are the readings different?

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Ateacher used a geiger-muller(gm)tube to measure the background radiation in her laboratory.
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