Application of the Compliance Algorithms for Building Materials. Annex VI (Chinese Edition)

A method is presented in this Annex for calculating dose due to external gamma radiation from building materials on the basis of the approach of Markkanen. The results are given in tabular form as specific dose rates. This allows the most typical dose assessments to be made without computer calculations. Five examples of such assessments are given in this Annex. The method is based on calculating the dose rate for a rectangular building constructed of building material of uniform density and containing radionuclides of uniform activity concentration. The dose rate indoors is calculated by summing the separately calculated dose rates due to radionuclides in the walls, floor and ceiling of a room. The effects of doors and windows will lower the dose rate by only a minor amount and so for simplicity doors and windows are not considered in the calculation. The calculation covers situations in which the radionuclides are distributed in two layers of separate building materials with different densities and activity concentrations; for example, concrete walls covered with a thin layer of another material such as tiles.