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Across 1. positron emission tomography 3. thallium decays by this method 7. B- and B+ are given off in this interaction 8. as low as reasonably achievable 9. radiation produced outside the nucleus 11. process of removal of an electron from an atom 15. this product is produced by an accelerator (cyclotron) or is a by-product of nuclear fission 16. food and drug administration 17. number of protons determines this product 22. the distance from the top of a wave to a subsequent wave 23. time it takes the body to get rid of radioactivity 26. this element same molecular properties as alpha 27. A.K.A. white blood cells 29. two .511 MeV photons 30. A.K.A. HMPAO 31. same number of neutrons 32. specific ionization 36. this process is used to assess a drug's safety and effectiveness before making it available to the public 37. same mass number 38. total effective dose equivalent 41. half life of 2.8 days 42. the simplest of all atoms; also called a protium 43. radiation that is produced inside the nucleus 45. process of converting one element into another

Down 1. incoming photon must have an energy greater than 1.02 MeV 2. a negatively charged particle 4. method of separating different substances through the use of a solvent passing over a stationary phase 5. time it takes for half of a radionuclide to decay 6. original radionuclide in any decay method 10. used to indicate that different types of radiation have different effects in humans 11. an electron gets ejected from the atom 12. same number of protons 13. occurs in the inner most shell 14. nuclear regulatory commission 18. linear energy transfer 19. lidofenin, disofenin, and mebrofenin are used to image this organ 20. thickness of any particular material necessary to reduce the intensity of radiation to half of its normal value 21. this pharmaceutical is boiled 24. used to produce short lived radionuclides 25. also known as cardiolyte 28. electrons are slowed down during this process 33. .15 uCi of Mo99 per one mCi of Tc99 in a generator eluat 34. this process refers to the pulling of eluate off of a generator 35. number of waves per unit time 39. occurs in the outer most shell, resulting in secondary radiation 40. this radioisotope has a half-life of 78 hours 44. macro aggregated albumin 46. radiation absorbed dose