X-rays and Gamma Rays have clear distiction between them, LIke how we seperate Microwaves and radio waves or red and green light, They are still different and are used in many different applications.
You don't die from an X-ray when checking for broken bones, You would die if it was a 2.5 MeV gamma that blasted through your body.
Um, you're confusing "amount of particles" with "energy of one particle".
And of course you can die from X-rays. Why do you think the nurses wear those heavy lead aprons when they have to be in the same room as you when taking an x-ray picture? For fun? (Usually they step outside, though.)
There's a reason why we try to limit our exposure to x-rays - it's called cancer risk. And the Therac 25 incident should show that you can indeed kill with "mere" x-rays.
I'm not particularly nervous about a 2.5 MeV gamma ray, by the way. You described it just fine: Most of the time, it will blast clear _through_ the body without hitting anything. Beta radiators are much more dangerous and Alpha radiation is the most dangerous if the source is inside your body. You seem to think that gamma rays are some kind of Kilowatt UV laser.
Edit: The Therac 25 created x-rays with about 25 MeV. So, your 2.5 MeV gamma ray is positively puny in comparison.
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