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
Trinity Site: 1945-1995. A National Historic Landmark, White Sands Missile Range, New Mexico · 第 5 / 19 题