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The instrumental line background of the Compton telescope COMPTEL
onboard the Compton Gamma-Ray Observatory is due to the activation
and/or decay of many isotopes. The major components
of this background can be attributed to eight
individual isotopes, namely 2D, 22Na, 24Na,
28Al, 40K, 52Mn, 57Ni, and 208Tl.
The identification of instrumental lines with specific isotopes
is based on the line energies as well as on the variation of the
event rate with time, cosmic-ray intensity, and deposited radiation dose
during passages through the South-Atlantic Anomaly. The
characteristic variation of the event rate due to a specific isotope
depends on its life-time, orbital parameters such as the altitude of the
satellite above Earth, and the solar cycle.
A detailed understanding of the background contributions from
instrumental lines is crucial at MeV energies for measuring the
cosmic diffuse gamma-ray background and for observing γ-ray line
emission in the interstellar medium or from supernovae and their
remnants. Procedures to determine the event rate from each background
isotope are described, and their average activity in spacecraft
materials over the first seven years of the mission is estimated
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