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Artificial radioactivity produced by cosmic rays in lead and iron

✍ Scribed by J. Clay; K.H.J. Jonker

Publisher
Elsevier Science
Year
1938
Weight
138 KB
Volume
5
Category
Article
ISSN
0031-8914

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✦ Synopsis

A counter is surrounded by lead and the variation is observed directly after covering it with a layer of 20 cm Pb. The experiment was repeated 10 times and the time for 3 Γ— 100 shocks recorded. The theoretical deviation to be expected is 1,8~/o, the experimental mean deviation was 1,05~o. After covering gnd uncovering, a deviation of 10% was found. With iron the deviation was 6 %.

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By using an ionisation instrument which records every one or two minutes it is possible to follow the variation of intensity of a radiation. We found that variations of gamma radiation were followed without any delay. On the contrary the variation of the intensity of cosmic radiation, by changing th

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✍ W.E. Ramsey; C.G. Montgomery; D.D. Montgomery πŸ“‚ Article πŸ“… 1939 πŸ› Elsevier Science 🌐 English βš– 155 KB

Clay and Van Tijn state that the "time of decay" is 8.6 minutes. terpret this to be the value of the half-life.