Which of the above areas do you find the toughest? (poll 9814382)

Which of the above areas do you find the toughest?

Background radiation

Nuclear decay

Safety precautions when using radioactive materials

Atomic structure and approximate sizes

Nuclear radiation

Fission and the chain reaction

Half-life

Fusion

The history of the atom

Radioactive isotopes and tracers

Select up to 3 answers.

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See this poll on: https://poll.fm/9814382/embed