4. METHOD OF SOLUTION
The program is divided into two separately executable parts. The first of these, FDOSE, computes gamma dose factors by a numerical volume integration of an espression involving the attenuation of gamma rays in air, modelled by a linear attenuation coefficient and a buildup factor, together with data specifying wind speed and direction, crosswinds, and the height and rate of radionuclide release. An eight point polynomial technique is used to perform the integration.
These dose rate factors may be stored in a data library for future use, or passed directly to the second part of the program, CHRONI, which combines them with radionuclide decay data to generate doses and air concentrations.
KRONIC uses three types of data library containing:
- data on radionuclide decay schemes, half lives and beta energy production
- data on photon production
- dose rate factors, as calculated by FDOSE.
The program includes libraries containing data for nearly 600 nuclides, including fission products and activation products.