宁波铁陨石宇宙成因核的测定

The Ningbo iron meteorite fell near Ningbo, Chekiang province, on October 4,1975. 103 days later, γ-ray spectrum of the meteorite, was undestructively measured by a low-level γ-ray spectrometer. It is shown that the specific activity of Mn^34 present in the Ningbo iron meteorite is ap proximately close to that of Mn^34 in the Bogou and Aroos meteorites, while the specific activity of Co^37 seems to be higher in the Bogou and Aroos than in the Ningbo.