Variation in Population Exposure in China as a Result of Differing Human Activities

The necessity of studying the variations in radiation levels dispassionately is discussed. Human activities may increase, but can also decrease, radiation dose to the population. Travel by air may cause a rise in population collective dose by 3.6 x 10 man.Sv, and travel by ship, train and vehicle may lead to a drop of 5.36 x 102 man.Sv. Dwellings of coal cinder brick may increase collective dose by 3.5 x 103 man. Sv, and buildings of reinforced concrete may decrease collective dose by 3.7 x 103 man.Sv. It is inadequate to study only those activities which may increase radiation levels.