Abstract
Recent work by Dyer and Morfill has shown that satellite measurements of the diffuse cosmic X-ray spectrum made with crystal scintillators may include errors due to radioactive spallation products formed in the detector by inner belt and cosmic ray protons.
An estimate is made of the magnitude of this source of background for the various experimental situations and it is shown that apparent features at 40 keV and 1 MeV are likely to be due to radioactive decays in the instruments. A review is made of experiments covering the range 1 keV-100 MeV in order to ascertain whether a single exponent spectrum is capable of fitting the experimental results. The astrophysical implications of such a spectrum are briefly considered.
Suggestions are made for the location and correction for background of future experiments.
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References
Abell, G. O.: 1957,Astrophys. J. Suppl. 3, 211.
Abell, G. O. and Eastmond, S.: 1970,Bull. Am. Astron. Soc. 2, 179.
Bergamini, R., Kondrillo, P., and Setti, G.: 1967,Nuovo Cimento 52B, 495.
Bratolubova-Tsulikidze, L. S., Grogorov, N. L., Prjakhin, E. A., Savenko, I. A., Yufarkin, V. Ja., Kalinkin, L. F., and Melioransky, A. S.: 1970,Proc. 13th Session of COSPAR, Leningrad.
Brini, D., Fuligni, F., and Hortsmann-Moretti, E.: 1971,Nuovo Cimento 6B, 68.
Cunningham, C., Groves, D., Price, R., Rodrigues, R., Swift, C., and Mark, N.: 1970,Astrophys. J. 160, 1177.
Damle, S. V., Daniel, R. R., Joseph, G., and Lavakare, P. J.: 1971,Astrophys. Space Sci. 14, 473.
Davidsen, A., Shulman, S., Fritz, G., Meekins, J. F., Henry, A. C. and Friedmann, H.: 1972, N.R.L. Preprint.
Dyer, C. S. and Morfill, G. E.: 1971,Astrophys. Space Sci. 14, 243.
Felten, J. E. and Morrison, P.: 1966,Astrophys. J. 146, 686.
Garmire, G. P.: 1970,Bull. Am. Phys. Soc. 15, 564.
Golenetskii, S. V., Mazets, E. P., Il'inski, V. N., Aptekar, R. L., Bredov, M. M., Gua'yan, Yu. A., and Panov, V. N.: 1971,Astrophys. Letters 9, 69.
Gorenstein, P., Kellog, E. M., and Gursky, H.: 1969,Astrophys. J. 156, 315.
Gursky, H., Solinger, A., Kellogg, E. M., Murray, S., Tananbaum, H., Giacconi, R., and Cavaliere, A.: 1972,Astrophys. J. 173, L99.
Holt, S. S., Boldt, E. A., Desai, U. D., and Serlemitsos, P. J.: 1969,Nature 224, 677.
Kasturirangan, K. and Rao, U. R.: 1972,Astrophys. Space Sci. 15, 161.
Kiang, T. and Saslaw, W. C.: 1969,Monthly Notices Roy. Astron. Soc. 143, 129.
Lavine, J. P. and Vette, J. I.: 1970, NASA SP3024, Vol. III.
Metzger, A. E., Anderson, E. C., Van Dilla, M. A., and Arnold, J. R.: 1964,Nature 204, 766.
Peterson, L. E.: 1965,J. Geophys. Res. 70, 1762.
Rudstam, G.: 1966,Z. Naturforsch. 21a, 1027.
Schwartz, D. A.: 1969, Thesis, U.C.S.D.
Schwartz, D. A., Hudson, H. S., and Peterson, L. E.: 1970,Astrophys. J. 162, 431.
Schwartz, D. A., Boldt, E. A., Holt, S. S., Serlemitsos, P. J., and Bleach, R. D.: 1971,Nat. Phys. Sci. 233, 110.
Silk, J.: 1968,Astrophys. J. 151, L20.
Silk, J.: 1970a,Space Sci. Rev. 11, 671.
Silk, J.: 1970b, in L. Gratton (ed.),Non-Solar X- and Gamma-Ray Astronomy, D. Reidel Publ. Co., Dordrecht-Holland, p. 392.
Stecker, F. W.: 1969,Nature 224, 870.
Stecker, F. W., Morgan, P. L. Jr., and Bredekamp, J.: 1971,Phys. Rev. Letters 27, 1469.
Toor, A., Seward, F. D., Cathey, L. R., and Kunkel, W. E.: 1970,Astrophys. J. 160, 209.
Vette, J. I., Gruber, D., Matteson, J. L., and Peterson, L. E.: 1970,Astrophys. J. 160, L161.
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This paper is largely based on a contribution to the IAU/COSPAR Symposium No. 55 on X-and Gamma-ray Astronomy held at Madrid, 11–12 May, 1972.
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Dyer, C.S., Engel, A.R. & Quenby, J.J. The shape of the diffuse cosmic X-ray spectrum. Astrophys Space Sci 19, 359–367 (1972). https://doi.org/10.1007/BF00645719
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DOI: https://doi.org/10.1007/BF00645719