  We consider a monopole detector interacting with a massive scalar field. The
radiative processes are discussed from the accelerated frame point of view.
After this, we obtain the Minkowski vacuum stress tensor measured by the
accelerated observer using a non-gravitational stress tensor detector as
discussed by Ford and Roman (PRD 48, 776 (1993)). Finally, we analyse radiative
processes of the monopole detector travelling in a world line that is inertial
in the infinite past and has a constant proper acceleration in the infinite
future.
