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Have been set a rather tricky question in physics, and wondered if you had any ideas on how I would go about answering it...

It is based on Fermi style estimation to try and encourage one to estimate and guess, the question is... 'How many particles of ionising radiation pass through your head every second?', I really have no idea how I would go about even guessing inaccurately the answer of this, never mind accurately so any help would be appreciated, thanks.

It is based on Fermi style estimation to try and encourage one to estimate and guess, the question is... 'How many particles of ionising radiation pass through your head every second?', I really have no idea how I would go about even guessing inaccurately the answer of this, never mind accurately so any help would be appreciated, thanks.

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