Positive definiteness of the gravitational radiation intensity in the theory of gravity with nonzero graviton mass

Gravitational radiation flux from arbitrary spatially bounded source is positively defined in the considered theory of gravity with a nonzero graviton mass. A link between energy losses by emission and a work of sources is established. It is shown that the total work contains a part resulted from the interaction of a source with a radiation field and a part resulted from a self-interaction of the field. This is just the sum of two parts that makes the work positively defined in the whole. The general form of a radiation spectrum-angular distribution is obtained taking into account spin and polarization states. For spherically symmetric sources, states with zero spin as well as zero projection on momentum of spin two make contribution into emission.