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Across 4. as low as reasonably achievable 6. another name for expressing LET 9. another method of minimizing radiation dose 11. total effective dose equivalent 13. far away the less radiation dose

Down 1. principles compare to shielding (thickness) 2. Si unit for roentgen; disintegration in air 3. lead barriers 5. has no threshold; gets worst with increasing dose 7. different types of radiation that produces biological effects 8. SI equivalent to REM 10. linear energy transfer 12. 100 Rad equals this