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Across 1. used in x-ray flourence and bone density gauges 3. tumour-seaking agent 7. a person who receives a radiation dose for a long period of time 8. radiometric dating:millions to billions of years 9. studying genetic diseases and affects 10. isotope prepared in cyclotron 12. location of leaks in water pipes 15. domestic smoke alarms 16. a person who receives a radiation dose for a short period time 18. effects that occur on a random basis 21. isotope prepared in a nuclear reactor 22. seen in the individula who receives the agent 23. radiotracing to identify sources of soil erosion and depositing 24. used to predict the bhaviour of heavy metals 25. supplied as a wire

Down 2. effects that can be directly related to the dose 4. enriched as a fuel for most nuclear reactors 5. cancer treatment as at tumour cells tend to be more suspencible 6. argon radiometric dating:100000 to several billion years 11. measures the age of young groundwater 13. seen in the offspring of the agent 14. treatment for red blood cells 17. date layers of soil and sand deposited up to about 80 years ago 19. locating damaged heart muscle 20. liver cancer therapy