Letter | Published:

Acceleration of the Decomposition of Crystals of Barium Aside by the Emission from Radium Emanation

Naturevolume 131page513 (1933) | Download Citation



DEHYDRATED crystals of barium azide decompose at a measurable rate above 100° C. giving nitrogen as a gaseous product. There is an induction period very similar to that observed with mercury fulminate and the reaction spreads from centres of metallic barium formed on the surface and in the interior of the crystal (F. E. Harvey, unpublished). The induction period is shortened and the rate of centre formation increased if the crystals are exposed to the emission from a platinum seed containing radium emanation. At 110°C., the induction period is shortened from 120 min. to 55 min. and the rate of acceleration of the reaction trebled when the intensity of the emission from the emanation seed is about 1 m. curie.

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  1. The University, Bristol

    • W. E. GARNER
    •  & C. H. MOON


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