Hi minseong, how would I estimate the count rate in question b) (ii)? would I just copy from the table?
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Hi minseong, how would I estimate the count rate in question b) (ii)? would I just copy from the table?
Hi Thibaud, thank you so much for your question.
Like your post, I also think that this question could have been worded more clearly.
What I interpreted from this question is that we should estimate the count rate originated from the source.
As the values of count rates from a distance of 7-9 cm suggest that background radiation is present (since alpha radiation won't travel more than 5-6 cm), we are able to identify that the value of the count rate from a distance of 2 cm also includes background radiation.
I reckon we can simply subtract the count rate from a distance of 2 cm by count rate from background radiation to solve this question. So the count rate will be approximately 542 (562-20).
Does this answer your question?