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A member asked:

How much brain radiation does it take to cause a decrease of intelligence in a teenager?

A doctor has provided 1 answer
Dr. Matt Wachsman answered

Specializes in Internal Medicine

Huge amount: In childhood leukemia treatment, radiation therapy can have an effect because the brain is still developing. It is nowhere near as sensitive after childhood and more radiation would be needed before the effect would be seen. That's a lot even compared to cancer therapy doses..

Answered 10/23/2015

2.1k views

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2 doctors weighed in across 2 answers

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