An Artificial Radioelement from Nitrogen


MESSRS. M. DANYSZ and M. Żyw, working in this laboratory, have bombarded diverse substances with rays from a thin-walled glass tube (resulting range about 5 cm.) containing some 15 millicuries of radon, and immediately afterwards have tested their activity with a Geiger-Müller counter. An activity decaying exponentially with a half period of 1.2 min. was found on all the substances examined, namely, platinum, silver, lead, calcium and nickel. No certain influence of the nature of the substance could be ascertained. The initial activity was of the order of 50 impulses per minute. The effect disappeared when the range of rays was reduced by two very thin gold foils or a few millimetres of air.

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    Note added to proof. We have since found that NaN3 gives a greatly increased effect, which confirms our assumptions.

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