ISOLA IV - a FORTRAN 77 code for the calculation of the long-term dose distribution in the environment of nuclear installations

The ISOLA computer code is used to calculate the annual radiation doses in the environment of the Karlsruhe Nuclear Research Center, due to the release of α- und β-active substances into the atmosphere. In the version ISOLA IV, the double Gaussian distribution model is strictly applied. As a consequence, the contribution of radioactivity from neighbour sectors is correctly taken into account. This makes possible the input of a 100 statistics as well as a 300 statistics. The code calculates optionally the dose rates due to the following exposure pathways: inhalation, β-submersion, ingestion and irradiation from the ground, the latter two due to dry and wet deposition. Wet deposition can be calculated either according to 'Allgemeine Berechnungsgrundlagen...' /1/ or with individually choosen washout coefficients. An unlimited number of emitters may be taken into account simultaneously. The emission rates are considered to be constant during a given time interval. Optionally, either the isodoses chart of a specified area (for instance a square area of 20 by 20 km) or a list of doses calculated at specified field points (for instance the residential areas) in the environment may be ordered by the user. The input and output are explained for a specific case. (orig.)