[Modelling the ecologic effect of accidents in gamma-treatment rooms]

The paper presents the procedure for evaluating the adverse radiation impact on the environment from the magnitude of the increased natural background while modelling emergencies on remote and intracavitary gamma-therapeutical apparatuses. It considers the accidents which result in full or partial failure of chamber protection with a full impaired source shield. The deleterious action of full chamber protection failure is displayed at about 12 km during accidents on remote gamma-apparatuses and at approximately 1,100 m during those on intracavitary equipment. In case of partially impaired chamber protection one should take into account the final dimensions of the source and the permeability of a chamber shield.