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Temperature dependence of nuclear decays in metallic environments is a controversial issue.We measured the temperature dependence of the β+-decay half-life of 22Na implanted into the metal host of palladium.It is found that the β+-decay half-life of22 Na in the metal Pd cooled to T=15 K is shorter by 0.46(14)%than that at room temperature.The result is consistent in sign with,but clearly smaller than,the estimated one by the Debye model.