%A"Perron, C [Centre National de la Recherche Scientifique (CNRS), 75 - Paris (France). Inst. d`Astrophysique]" %A"[Museum National d`Histoire Naturelle, 75 - Paris (France)]" %D1993 %I; %2 %J[] %K36 MATERIALS SCIENCE, APATITES, PHYSICAL RADIATION EFFECTS, CHONDRITES, ANNEALING, FISSION YIELD, IRRADIATION, MEV RANGE 100-1000, PARTICLE TRACKS, PROTON BEAMS, SIMULATION, SPALLATION %PMedium: X; Size: pp. 739-744 %TCosmic ray-induced spallation recoil tracks in meteoritic phosphates: simulation at the CERN synchrocyclotron %XAnnealed meteoritic phosphate crystals have been irradiated by 600 MeV protons to simulate cosmic ray irradiation in space. Spallation recoil tracks were then revealed, which mimic fission tracks, specially when observed in the SEM. A production yield of 9.3 {+-} 2.2 x 10{sup 8} spallation track per proton has been obtained for merrillite, and a substantially lower value (2.5 per proton) for apatite. A nominal production yield in space of 6 tracks per year has been derived, which may be used for a rough estimate of spallation track densities in chondritic merrillite. (Author). %0Journal Article %NCONF-9209413-;Journal ID: NTRMDS; ISSN 0969-8078; TRN: GB9701202044943 %1 %CUnited Kingdom %Rhttps://doi.org/10.1016/0969-8078(93)90168-4 Journal ID: NTRMDS; ISSN 0969-8078; TRN: GB9701202044943 GBN %GEnglish