Are gamma rays always harmful?

Two days ago I asked how we can detect a (really) small black hole. The best answer (to me) was "gamma rays". Since this black hole is relatively close to our planet (a few AUs), this could be a problem because in my story it should not be a threat. So I was wondering if gamma rays are always harmful (I know that this kind of radiation is used in cancer treatment) and in particular if I can make harmless the gamma rays of my mini-black hole for our biosphere.

Black hole properties (if it helps) :

• Radius: 2.5 attometers;
• Mass: 1.7 millions of tonnes;
• Hawking temperature: 6.3 GeV;
• Total power output: 20 PW;
• Lifespan: ≈ 80 years;

posted over 7 years ago

Lupetto‭

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