Products of Nuclear Decay

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Across
  1. 1. strontium-90
  2. 6. iron-53
  3. 8. radium-226
  4. 10. potassium-42
  5. 14. iodine-131
  6. 16. gold-198
  7. 17. nitrogen-16
  8. 18. krypton-85
Down
  1. 2. uranium-238
  2. 3. phosphorus-32
  3. 4. calcium-37
  4. 5. francium-220
  5. 7. cobalt-60
  6. 9. hydrogen-3
  7. 11. plutonium-239
  8. 12. neon-19
  9. 13. radon-222
  10. 15. cesium-137