Aha Trivia Stuff Everyone Should Know
Aha Trivia: Stuff Everyone Should Know · ahatrivia.com/mb-nuclear-science-61149086e56b

As a radioactive source moves farther from a detector, what usually happens to the count rate?

It decreases.

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  1. It stays exactly the same
  2. It increases sharply
  3. It decreases ✔

Why: Radiation spreads out with distance, so a detector farther away counts fewer events per minute.

Huh, didn't know that: Radiation spreads out with distance, so a detector farther away counts fewer events per minute.

The dad joke
Distance is a real counter to high readings.
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References

Answer: It decreases. Radiation spreads out with distance, so a detector farther away counts fewer events per minute.

  1. Scouting America: Nuclear Science www.scouting.org/merit-badges/nuclear-science
    show how the counts per minute change as the source gets closer to or farther
    Checked 2026-11-07.

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