  This study presents a background estimation for the Cubesats Applied for
MEasuring and LOcalising Transients (CAMELOT), which is a proposed fleet of
nanosatellites for the all-sky monitoring and timing based localization of
gamma-ray transients with precise localization capability at low Earth orbits.
CAMELOT will allow to observe and precisely localize short gamma-ray bursts
(GRBs) associated with kilonovae, long GRBs associated with core-collapse
massive stars, magnetar outbursts, terrestrial gamma-ray flashes, and gamma-ray
counterparts to gravitational wave sources. The fleet of at least nine 3U
CubeSats is proposed to be equipped with large and thin CsI(Tl) scintillators
read out by multi-pixel photon counters (MPPC). A careful study of the
radiation environment in space is necessary to optimize the detector casing,
estimate the duty cycle due to the crossing of the South Atlantic Anomaly and
polar regions, and to minimize the effect of the radiation damage of MPPCs.
