منابع مشابه
Radioactivity and Physiological Action of Potassium
1. The non-radioactive cesium ion can replace the potassium ion almost quantitatively in solutions required for the development of the egg of the sea urchin into swimming blastulae. 2. Thorium chloride and uranium acetate cannot replace the potassium chloride in the solutions required for the development of the egg. 3. Thorium chloride and uranium acetate do not antagonize the action of the pot...
متن کاملThe Radioactivity of Potassium from Human Sources
A comparison of the radioactivity of potassium from human and commercial sources indicates that the radioactive isotope K(40) is probably 1 or 2 per cent less abundant in human potassium.
متن کاملRadioactivity of Potassium from H U M a N Sources
The purpose of this paper is to present data which have accumulated in our laboratory over several years tending to show that the relative abundance of the naturally radioactive isotope of potassium K 4° in the human body is probably about 2 per cent less than in commercial or "shelf" potassium as supplied in the market. The work was begun on account of the statement of Ernst (1934) based on an...
متن کاملHigh-pressure alloying of potassium and iron: Radioactivity in the Earth’s core?
[1] High-resolution x-ray diffraction provides evidence that potassium (K) alloys with iron (Fe) when the two pure elements are heated together at pressures above 26 gigapascals (GPa). Increases of 2–3% in volume of the e (hexagonal close packed: hcp) high-pressure phase of Fe can be attributed to the incorporation of 1 atomic% ( 7000 ppm by weight) K into Fe. Our results provide experimental s...
متن کاملTwo-proton radioactivity of 45Fe.
In an experiment at the SISSI-LISE3 facility of GANIL, the decay of the proton drip line nucleus 45Fe has been studied. Fragment-implantation events have been correlated with radioactive decay events in a 16x16 pixel silicon-strip detector. The decay-energy spectrum of 45Fe implants shows a distinct peak at (1.14+/-0.04) MeV with a half-life of T(1/2)=(4.7(+3.4)(-1.4)) ms. None of the events in...
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ژورنال
عنوان ژورنال: Nature
سال: 1934
ISSN: 0028-0836,1476-4687
DOI: 10.1038/134377a0