Check out this radiation dose chart:

1. Sleeping next to someone = 0.05 microSieverts
2. [Item 1] X 2: Eating 1 banana = 0.10 microSieverts
3. [Item 2] X 10: 1 arm X-ray, or using a CRT monitor for a year = 1 microSievert
4. {Item 3] X 5: Dental or hand X-ray = 5 microSieverts
5. [Item 4] X 2: Background dose received by a normal person over a single day = 10 microSieverts
6. [Item 5] X 4: Flight from New York City to Los Angeles = 40 microSieverts
7. [Item 6] X 25: EPA yearly limit on radiation exposure to a single individual; or maximum external dose from Three Mile Island accident = 1,000 microSieverts = 1 milliSievert
8. [Item 7] X 3: Mammogram = 3 milliSieverts
9. [Item 8] X 1.93: Chest CT scan = 5.8 milliSieverts
10. [Item 9] X 8.6: Maximum yearly dose for a U.S. radiation worker = 50 milliSieverts
11. [Item 10] X 2: Lowest 1-year dose clearly linked to increased cancer risk = 100 milliSieverts
12. [Item 11] X 2.5: Dose limit for emergency workers in life-saving operations = 250 milliSieverts
13. [Item 12] X 8: Severe radiation poisoning, in some cases fatal = 2,000 milliSieverts = 2 Sieverts
14. [Item 13] X 4: Fatal dose, even with treatment = 8 Sieverts
15. [Item 14] X 6.25: 10 minutes next to Chernobyl reactor core after explosion and meltdown = 50 Sieverts