Radionuclide depth profiles in Dhajala chondrite

Spallation produced radionuclides¹⁰Be,²²Na and²⁶Al and low energy neutron capture radionuclide⁶⁰Co have been measured in several fragments of the Dhajala chondrite, their shielding depth in space having been established by measurement of cosmic ray track density. These data enable us to obtain depth profiles of production rates of these nuclides within the meteoroid body. These profiles are discussed in terms of their dependence on size of the meteoroid and variations of galactic cosmic ray fluxes in time and space. The slowing down density of neutrons of 0.1 neutrons/cm³ sec is determined near the centre of the Dhajala meteoroid based on⁶⁰Co.