Pattern of Bombardment-Produced Radionuclides in Rock 10017 and in Lunar Soil

A large number of radionuclides have been measured as a function of depth in lunar rock 10017 and in bulk fines. Data are reported on $^{10}$Be, $^{22}$Na, $^{26}$Al, $^{36}$Cl, $^{49}$V, $^{53}$Mn, $^{54}$Mn, $^{55}$Fe, $^{56}$Co, $^{57}$Co, and $^{59}$Ni and on upper limits for $^{46}$Sc, $^{48}$V, $^{51}$Cr, and $^{60}$Co. The results for several nuclides show striking evidence of excess surface production attributable to solar flare particles. Data for short-lived species, $^{56}$Co, $^{57}$Co, $^{54}$Mn, $^{55}$Fe, and $^{22}$Na, appear consistent with fluxes from known recent events. Long-lived species demonstrate the existence of solar flare protons and alphas at least for the last 10$^{5}$ to 10$^{6}$ years, at fluxes comparable to those now observed.