... radiation(externally and internally) and β and α radiation (mainly internally). Externalirradiation is caused by radioactivity present in the soil and in any other materialsurrounding our bodies, including ... cisterns7E+04 Iodine prophylaxis for children and pregnant women131I7E+05 6E+04 Sheltering1E+ 06 Wearing (provisional) filter masks7E+05 Iodine prophylaxis for adults7E+ 06 6E+05 Evacuation1E+04 ... activity in dwellings in the Czech Republic TABLE 3.3Typical Volume Activities of 222 Rn and 220 Rn in the Air (Outdoor and Indoor) and Typical Annual Effective Doses (Outdoor and Indoor)...