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Across 3. R-d-------e D---y - One source of radiation is the nuclei of unstable atoms. For these radioactive atoms to become more stable, the nuclei eject or emit subatomic particles and high-energy photons 6. Like visible light and x rays, gamma rays are weightless packets of energy called p-----s 7. The major types of radiation emitted as a result of spontaneous decay are a---- and b--- particles 8. All repeat radiographs ---- be completed under the direct supervision of a qualified practitioner 10. B--- p-------s are more penetrating than alpha particles, but are less damaging over equally traveled distances 12. G---- r--s stopped by several feet of concrete 13. Implement the --- day rule when radio graphing female patients within child-bearing age 14. A---- p-------s are energetic, positively charged particles (helium nuclei) that rapidly lose energy when passing through matter.

Down 1. The primary radioactive elements found in the earth's crust are u-----m, t-----m, and p-------m, and their radioactive derivatives 2. R----, which emanates from the ground, is another important source of natural radiation. 4. A---- p------s are stopped by a sheet of paper 5. - ---- are high-energy photons produced by the interaction of charged particles with matter 9. Ionizing radiation that has s-------t energy to remove electrons from atoms. 11. Radiation can affect cells of the body, i--------g the risk of cancer or harmful genetic mutations