The solar neutrino capture rate measured by SAGE is well below that predicted by solar models. To check the overall experimental efficiency, we exposed 13 tonnes of Ga metal to a reactor-produced 517 kCi source of ⁵¹Cr. The ratio of the measured production rate to that predicted from the source activity is 0.95±0.11(stat)+0.05/-0.08(syst). This agreement verifies that the experimental efficiency is measured correctly, establishes that there are no unknown systematic errors at the 10% level, and provides considerable evidence for the reliability of the solar neutrino measurement.
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Abdurashitov et al. (1996) studied this question.
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