Some mathematical methods for radioactivity transport calculation

To reduce the machine computing time in determination of radioactivity transport as well as to obtain the possibility for using small computers, considered are the methods of the solving the first order equation system with constant coefficients. Sets of equations are divided in two groups thereby: systems with triangular matrix; systems with complete matrix. Programs were compiled and calculations were carried out. They provide the advantage in computing rate as compared with classical numerical methods of the Runge-Kutta type. It is noted that above methods are not the only effective ones. The Laplace transformation method is also used to solve such problems