"Nihon Univ., Tokyo. Coll. of Humanities and Sciences" . . "Baryons." . . "Years Living Radioisotopes." . . "Electron Capture Radioisotopes." . . "Beta-minus Decay Radioisotopes." . . "Cosmic Protons." . . "Hadron Reactions." . . "Beryllium 10 Target." . . "Materials." . . "Baryon Reactions." . . "Kohl, C.P." . . "Beryllium Isotopes." . . "Odd-even Nuclei." . . "Solar Particles." . . "Intermediate Mass Nuclei." . . "Beta Decay Radioisotopes." . . "Solar Protons." . . "Radiations." . . "Kobayashi, K." . . "Arnold, J.R." . . "Tokyo Univ. (Japan). Research Center for Nuclear Science and Technology" . . "Honda, M." . . "Imamura, M." . . "Lunar Materials." . . "Manganese 53 Target." . . "Aluminium 26 Target." . . "Light Nuclei." . . "Numerical Data." . . "Tokyo Univ. (Japan). Faculty of Science" . . "Solar Radiation." . . "Nagai, H." . . "Alkaline Earth Isotopes." . . "Ionizing Radiations." . . "Classical And Quantum Mechanics, General Physics." . . "Fermions." . . "Manganese Isotopes." . . "Data." . . "Isotopes." . . "Yamashita, H." . . "Nucleons." . . "Beryllium 10." . . "Beta-plus Decay Radioisotopes." . . "Elementary Particles." . . "Tokyo Univ., Tanashi (Japan). Inst. for Nuclear Study" . . "Seconds Living Radioisotopes." . . "Nuclear Reactions." . . "Aluminium Isotopes." . . "Charged-particle Reactions." . . "Aluminium 26." . . "Information." . . "Proton Reactions." . . "Nucleon Reactions." . . "Experimental Data." . . "Hadrons." . . "Even-even Nuclei." . . "Cosmic Radiation." . . "Nuclei." . . "Reedy, R.C." . . . . . . . . . . "Cosmic ray produced ¹°Be (t₁₂ = 1.6 x 10⁶ years) activities have been measured in fourteen carefully ground samples of lunar surface rock 68815. The ¹°Be profiles from 0 to 4 mm are nearly flat for all three surface angles measured and show a very slight increase with depth from the surface to a depth of 1.5 cm. These depth profiles are in contrast to the SCR (solar cosmic ray) produced ²⁶Al and ⁵³Mn profiles measured from these same samples. There is no sign of SCR produced ¹°Be in this rock. The discrepancy between the data and the Reedy-Arnold theoretical calculation (about 2 dpm ¹°Be/kg at the surface) can be explained in two ways: (1) the low energy proton induced cross sections for ¹°Be production from oxygen are really lower than those used in the calculations or, (2) compared to the reported fits for ²⁶Al and ⁵³Mn, the solar proton spectral shape is actually softer (exponential rigidity parameter Ro less than 100 MV), the omnidirectional flux above 10 MeV is higher (more than 70 protons/cm² s), and the erosion rate is higher (greater than 1.3 mm/My). ¹°Be, as a high energy product, is a very useful nuclide for helping to obtain the SCR spectral shape in the past. 23 refs., 3 figs., 1 tab."@en . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . "¹°Be profiles in lunar surface rock 68815"@en . . . . . . . . . . . . . "Yoshida, K." . . "Odd-odd Nuclei." . . "Manganese 53." . . "Nishiizumi, K." . . . . "Targets." . . "Radioisotopes." . . "Protons." . . "Stellar Radiation." . .