I, radioactive contamination on the human body of the harm nowadays, the decoration industry as the day rush. Many people in the residential construction and apartment decoration, the lack of scientific testing procedures and means, but also the blind pursuit of luxury, unaware that this may introduce a large number of radioactive substances into the apartment, the formation of modern urban apartment new source of pollution - radioactive pollution. The existence of such radioactive contamination will seriously jeopardize human health, the light make people dizzy and insomnia, neurasthenia, mental atrophy, the heavier make people induce cancer, loss of fertility, or even death, women suffering from radiation during pregnancy will cause fetal deformities and miscarriage. Second, the local building materials in the γ radiation intensity of the impact of the city's exposed lithology is mainly for the Yanshan period granite, metamorphic rocks and purplish-red siltstone, sandstone, conglomerate, which measured the γ radiation intensity: granite for 60-80 micron/hour; the rest of the 10-20 micron/hour. With the distribution of rock outcrops, the measured ground γ radiation intensity varies, for example, the lithology exposed in the northwest is mainly granite, with a ground γ radiation intensity of 50-100 μL/h, the ground γ radiation intensity measured in the excessive parts of the edge of the granite and siltstone and metamorphic rocks is 40-70 μL/h, and the ground γ radiation intensity of the rock outcrops exposed from the center to the east is 14-26 μL/h. The ground γ radiation intensity of the exposed rocks is mainly siltstone and conglomerate. ～The ground γ radiation intensity measured in the main siltstones and conglomerates of the central to eastern outcrops was 14 to 26 mrem/h. In addition to its radioactive content and γ radiation intensity is high in granite, and rich in uranium, and the surface weathering layer is rich in rare earth mineral resources, due to artificial gravel and slate processing, mining caused by the destruction of vegetation, rainfall in the east and west of the two rivers sedimentary accumulation of river sand, measured γ radiation intensity of the west of the river sand for the 10-15 μLun/hour, the east of the river sand for the 8-10 μLun/hour, the former is significantly higher than the latter. The former is significantly higher than the latter. The reason for this may be related to the distribution of rock outcrops and the existence of uranium deposits, mining and stone processing. (Among them: the exposed lithology in the upper reaches of the West River is mainly granite, and the existing uranium deposits have been continuously mined over the years. On the other hand, the exposed lithology on both sides of the East River is mainly siltstone and conglomerate, and no uranium deposits exist.) At the same time, the content of radioactive uranium in the water was measured to be 1.4-10-6 g/L in the West River and 3.9-10-7 g/L in the East River, with the former being significantly higher than the latter. Third, the level of γ radiation intensity in the room γ radiation intensity level of housing construction and renovation of sand, stone, cement, bricks, tiles and other materials, the use of these materials after the construction and renovation of the room, measured its γ radiation intensity is also different: (1) γ radiation intensity of different types of buildings γ radiation intensity measured from the ground at a height of about 0.5m γ radiation intensity, respectively: adobe walls 10 to 14 μL/h, brick and wood 7-9 μL/h, granite veneer walls 37 to 14 μL/h, brick and wood 7-9 μL/h. Granite wall surface 37-52 μL/h (of which flesh red granite is the highest, light gray is relatively low), the results show that the intensity of γ radiation: brick < adobe wall < granite. (2) In the same building, the γ-radiation intensity measured on each floor with different decoration materials are: cement floor 10-14 μL/h, wear-resistant bricks 16 μL/h, ceramic tiles 29-39 μL/h. The results show that the γ-radiation intensity of cement floors is lower than that of adobe walls, which is the highest. The results show that γ radiation intensity of cement floor < wear-resistant brick < tile floor. (3) After testing the ground floor of most buildings up to the third floor, the intensity of γ radiation is relatively high, probably related to the structure of the rock and soil on the ground, and with the increase in the level of the floor γ radiation intensity level has been reduced, in line with the normal law. For example, the results of the testing of Block A and Block B of a small community building in the city were as follows: from the ground floor to the third floor, the γ-radiation intensity was 37-43 mrem/hour, and from the fourth floor to the eighth floor, the γ-radiation intensity was 29-37 mrem/hour. (4) It was found in the actual tests that the γ radiation intensity produced by different river sand choices in the same building was also somewhat different, for example, the indoor γ radiation intensity measured from the ground floor to the third floor was 24-31 μL/h, while the indoor γ radiation intensity measured from the fourth to the eighth floors was 38-52 μL/h. It was understood that the east river sand construction material was chosen for the ground floor to the third floor, while the west river sand construction material was chosen for the fourth to the eighth floors. To summarize, the γ radiation intensity of the floors using west river sand is significantly higher than that of the floors using east river sand, which indicates that the river sand from the east and west rivers mentioned earlier is related to the mining pollution of granite and radioactive uranium mines with high radioactivity content, respectively. Builders should be in line with the health and safety of people from the start, careful selection of building construction materials. IV. Suggestions (1) The pollution of radioactive building materials must attract the great attention of the relevant departments to legislate for the safety of building materials. (2) City residents should raise awareness of self-protection, when buying building stone and decoration materials, it is best to ask the relevant departments to test and choose materials with lower radioactive element content. (3) According to the level of radioactivity of local building materials, it is better to choose granite of dark series and gray series of granite in line color series, which have relatively low content of radioactive elements. (4) The relevant departments should be in the spirit of living environment, human health is responsible for the spirit of strengthening the monitoring and management of the quarry, the government of radioactive substances exceeding the standard of the quarry should be resolutely closed. In order to prevent radioactive contamination sources into thousands of households. (5) residents on weekdays should open the windows, if necessary, assisted by mechanical ventilation exhaust (especially air-conditioned rooms), the radon gas diffuse in the living room at any time outside, or the use of air anion generators and other remedial measures to mitigate the impact of radioactive substances, indoor ventilation is the simplest and most effective way to remove all radioactive substances.
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