Gamma rays and microwaves never have the same effect on tissue.

The lumps of energy (photons) in gamma rays are so large that when they hit tissue they break molecules, including DNA, so they heat and damage tissue. They also penetrate all the way through the body easily.

The lumps of energy in microwaves are so small that they only shake molecules in the body, causing heat but not breaking them. Most microwaves only penetrate a few mm or cm into the body. If there are enough microwaves they can produce enough heat to do damage (cook).

Thank you so much for you , I know this information but when change the distance due to gamma or try to reduce frequency of gamma with any (x_material ) can we reach the point as critical point with frequency similar frequency of lump .

Thank you so much for you

I hope for you a nice day

Qusay Kh. Al_Dulamey

If you change the frequency it isn't a gamma ray. Gamma rays don't change frequency. It is a gamma ray if the frequency is greater than about 1019 Hz, or ten million million million cycles per second. This is about a thousand million times higher than microwaves.

It is the frequency that determines if it is a gamma ray, and how much energy is in each photon. This also does not change with distance or shielding. Gamma rays spread out with distance and hit things less often, but still with the same frequency and same size lump of energy.