The structure of the CGRO satellite is irradiated by cosmic rays and trapped particles fromradiation belts. These incident particles produce radioactive nuclei in nuclear reactions with the satellite structure. Most of the radiation dose can be attributed to the passages through the South Atlantic Anomaly. The incident particle flux on the COMPTEL instrument is estimated from the event rate of a plastic scintillation detector. This event rate is modeled with a Neural Network simulation. The increase of the event rate during SAA passages is taken as a measure for the amount of induced radioactivity. A Neural Network Model is used to derive the buildup ofradioactive nuclei in the instrument over the first five years of the mission. Measurements of the internal 22Na - and 24Na-activity are used to estimate the proton flux in the SAA. The result is consistent with earlier measurements and models.
Space Science Center, Physics
AIP Conference Proceedings
Digital Object Identifier (DOI)
A time dependent model for the activation of COMPTEL Varendorff, Martin and Oberlack, Uwe and Weidenspointner, Georg and Diehl, Roland and van Dijk, Rob and McConnell, Mark and Ryan, James, AIP Conference Proceedings, 410, 1577-1581 (1997), DOI:http://dx.doi.org/10.1063/1.54049
© 1997 American Institute of Physics