| タイトル | Neutron Induced Backgrounds In the MIXE X-Ray Detector at Balloon Altitudes |
| 著者（英） | Colborn, B. L.; Ramsey, B. D.; Dietz, K. L.; Armstrong, T. W. |
| 著者所属（英） | NASA Marshall Space Flight Center |
| 発行日 | 1997-01-01
1997 |
| 言語 | eng |
| 内容記述 | The MIXE detector developed at NASA/MSFC is designed for x-ray astronomy and consists of a multiwire proportional counter sensitive to photons less than 150 keV. The detector has been flown on several balloon flights with higher than expected background levels observed. Previous predictions of the detector background due to atmospheric gamma-ray and cosmic diffuse sources were much less (factor of 3) than flight background measurements. The work reported here was undertaken to determine if the additional contribution from gamma-rays generated by albedo and cosmic-ray induced neutrons in the detector and payload assembly could account for the background levels observed. Monte Carlo nuclear interaction and radiation transport simulations were made for the ambient cosmic-ray environment corresponding to a previous MEE balloon flight at 3 g/cm(exp 2) residual atmosphere and 42 N geomagnetic latitude. The omnidirectional albedo neutron spectrum and the GCR proton spectrum which were used as input to the calculations are shown. For the albedo angular distribution, the predicted up/down flux ratio of 2.5 was used together with the angular dependence measured by Preszler, et al. |
| NASA分類 | Space Radiation |
| レポートNO | 97N25787 |
| 権利 | Copyright, Distribution as joint owner in the copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/541422 |
