Detection and evaluation of radon content in indoor building materials

The room model using the building materials used in the actual sample room according to the proportion was established, and the model had been sealed for 40 days. Finally. two groups of analysis experiments were designed. The radon concentration released in all kinds of building materials was measured by RAD-7 radon measuring instrument, and the proportion of ²²²Rn concentration released in each building material of the sample room was calculated, Measuring the number of gamma ray particles released by different types of the same quality building materials after sealing by HPGe detector, the proportion of radon concentration released by the building materials was calculated. Two sets of data are finally worth the red brick: cement: marble: putty paste:sand radon concentration contribution ratio of 69: 16: 9: 5: 1, which is important for indoor radon concentration source and protection. (authors)