Cosmic ray produced Al26 and Na22 activities in chondrites have been studied by nondestructive γ (511 keV) — γ coincidence spectroscopy. The values of the Αl26 specific activities of the four measured hypersthene chondrite samples are nearly equal, and have a mean value of 0.061 Αl26 e+-decays/min. g. The Na22 specific activity of the Bruderheim chondrite was found to be 0.094 Na22 disint./min. g in agreement with the results obtained by other authors using different methods. From the Na22 activity and the Ne22 content of our sample we have calculated a cosmic ray exposure age of 26 × 106 y for Bruderheim. Exposure ages of other chondrites are discussed. Single crystal γ-spectroscopy of Bruderheim shows in addition to Al26 and Na22 the presence of Mn54 and K40.