we have used. Comparing the results obtained with counters {c') and {d') with the corresponding results obtained from (c) and (d), a small increase in the coincidence rate is noted. Considering the fact that the counters (c f ) and (d f ) are more sensitive to photons of low energy, the increase in the number of coincidences observed can be explained by the hypothesis that a fraction of the coincidences are due to the association between 7-radiation and x-rays subsequent to iT-capture. A sensible increase in N is obtained only for counters with KF (A?>-A^=0.48:db0.26) and not for those with KG, This agrees with the hypothesis that the increase is actually caused by x-rays of the K a line of argon which are strongly absorbed in chlorine.The hypothesis that there is an association between iT-capture and 7-radiation justifies the magnitude of the observed effect.

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