Typical radiation exposures for Americans
Per The National Council on Radiation Protection
On hour at ground zero = 1/2 mrem
Cosmic rays from space = 40 mrem at sea level per year
Radioactive minerals in rocks and soil = 55 mrems per year
Radioactivity from air, water, and food = anywhere from 20 to 400 mrem per year
About 22 mrem per chest X-ray and 900 mrem for whole-mouth dental X- rays
Smoking one pack of cigarettes a day for one year = 40 mrem
Miscellaneous such as watch dials and smoke detectors = 2 mrem per year
How to Get to Trinity Site
Trinity Site, where the world's first atomic bomb was exploded in 1945, is normally open to the public twice a year--on the first Saturday in April and October.