How can radioisotopes help in diagnosing brain tumour?

After giving the radioactive product, the brain emits gamma ray which were measure with the help of Geiger counter. The measurement were done one hour after the injection and after 24 hours. So, this difference in the measurement is useful in diagnosing the brain tumours. 

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Radio-isotopes may emit x-ray / gamma radiations that are used in diagnosis due to their high penetrating power.

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