Gamma Rays

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Across
  1. 2. gamma rays bursts are the most powerful explosion since _____
  2. 3. gamma rays are a major source of these
  3. 4. used in what type of therapy
  4. 6. gamma rays are highly penetrating and can cause instant damage to _____
Down
  1. 1. gamma rays are found in these
  2. 5. what superhero gained powers from this