Radium content of some Tertiary granites in Kyushu
نویسندگان
چکیده
منابع مشابه
the washback effect of discretepoint vs. integrative tests on the retention of content in knowledge tests
در این پایان نامه تاثیر دو نوع تست جزیی نگر و کلی نگر بر به یادسپاری محتوا ارزیابی شده که نتایج نشان دهندهکارایی تستهای کلی نگر بیشتر از سایر آزمونها است
15 صفحه اولAn improved Geiger-counter arrangement for determination of radium content.
Geiger-counter apparatus in which several counters may be placed in any position relative to each other is described. A circular arrangement of counters to give a counting rate approximately independent of the position of a so urce near the center of the circle is discussed. The relation of the I osition of the source to the counting rate of a single Geiger counter is discus ed. A method of cal...
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In 1895 the discovery of X-rays by Rontgen led others to wonder if invisible radiations of a similar nature could be produced by other means than a Crookes' tube. In the following year Monsieur Henri Becquerel, in Paris, experimented in this direction, and by good fortune he first tried a salt of uranium. He took a photographic plate and wrapped it in black paper, which completely shielded it f...
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Background: Hair dyes are the important materials widely used by various peoples in Iraq and other countries. The present work investigates the presence of the effective radium content and radon exhalation rate in hair dyes samples. Materials and Methods: Twenty hair dyes samples were collected from Iraqi markets. Sealed can technique using LR-115 type II plastic track detector s ha...
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It has been estimated that 92 per cent of the total radiation emitted by radium in equilibrium with its subsequent products is given off in the form of alpha-rays. This, however, cannot be utilized when the source is enclosed in an ordinary container, because the alpha-rays are absorbed completely by even a small thickness of glass. About 3.2 per cent of the total radiation is emitted in the fo...
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ژورنال
عنوان ژورنال: The Journal of the Japanese Association of Mineralogists, Petrologists and Economic Geologists
سال: 1958
ISSN: 0021-4825,1883-0765
DOI: 10.2465/ganko1941.42.302