scholarly journals On the Equilibrium of the Radioactive Elements in the Hydrosphere. III. On the Ratio of Thorium Emanation to Radium Emanation in the Hydrosphere

1949 ◽  
Vol 22 (1) ◽  
pp. 34-42 ◽  
Author(s):  
Kazuo Kuroda ◽  
Yuji Yokoyama
Keyword(s):  
Radioactive Elements ◽  
Radium Emanation

scholarly journals The β-ray spectrum of mesothorium 2

1924 ◽  
Vol 106 (739) ◽  
pp. 632-640 ◽  
Keyword(s):  
Electronic Structure ◽  
Strong Evidence ◽  
Quantum Dynamics ◽  
Radioactive Elements ◽  
Radium Emanation ◽  
Γ Rays

In recent years much attention has been directed to the detailed study of the magnetic β-ray spectra of some of the radioactive bodies, since the lines in these β-ray spectra have been shown to be due to the quantum conversion of γ-rays into β-rays in their passage through the ordinary electronic structure of the atom. There is strong evidence that these γ-rays have their origin in the nucleus, and the frequency of some of them can be deduced from a study of the β-ray spectrum. Attention has been paid mainly to the radioactive elements radium B and radium C, as strong sources of these elements can be obtained by exposure to radium emanation. In particular, Ellis and Ellis and Skinner have analysed in detail the β-ray spectra of these elements, and have shown that the γ-rays from the nucleus can be accounted for as being due to transitions in a system of levels, indicating that the quantum dynamics is applicable to the nucleus.

scholarly journals The atomic weight of lead from samarskite

1918 ◽  
Author(s):  
◽  
Arthur Lowell Davis
Keyword(s):  
Atomic Weight ◽  
Radioactive Elements ◽  
Radium Emanation

Text from page 1: In the disintegration of the radioactive elements, since each a-transformation involves the loss of an atom of helium and nothing else which in weighable, the atomic weight of the product should be just 3.99 less than that of the origianl substance, since 3.99 is the atomic weight of the helium evolved during the a-transformation. Thus if radium has an atomic weight of 225.97, radium emanation, the result of the loss of one a-particle, should have an atomic weight of 221.98; radium D, involving the loss of three more a-particles, should be 210.01; and radium G, yet another a-transformation, hsould be 206.02.

On the effect of radium emanation on the vascular lumen

1926 ◽  
Vol 22 (11) ◽  
pp. 1201-1210
Author(s):  
A. N. Bykhovskaya
Keyword(s):  
Biological Effects ◽  
Theoretical Interest ◽  
Radioactive Elements ◽  
Radium Emanation ◽  
Vascular Lumen ◽  
The Future

The discovery of the radioactive elements had consequences far beyond the limits of this special field of radioactivity. In medicine, this discovery has already played an outstanding role and promises even greater prospects for the future. Therefore, the elucidation of the biological effects of radium preparations is of great practical as well as theoretical interest. This kind of research is particularly timely at this time.

scholarly journals Gravitational Collapse versus Thermonuclear Explosion of Degenerate Stellar Cores

1994 ◽  
Vol 147 ◽  
pp. 186-213
Author(s):  
J. Isern ◽  
R. Canal
Keyword(s):  
Neutron Star ◽  
White Dwarfs ◽  
Light Curves ◽  
Type Ia Supernovae ◽  
Radioactive Elements ◽  
Border Line ◽  
Thermonuclear Explosion ◽  
Type Ia ◽  
Γ Rays ◽  
Ia Supernovae

AbstractIn this paper we review the behavior of growing stellar degenerate cores. It is shown that ONeMg white dwarfs and cold CO white dwarfs can collapse to form a neutron star. This collapse is completely silent since the total amount of radioactive elements that are expelled is very small and a burst of γ-rays is never produced. In the case of an explosion (always carbonoxygen cores), the outcome fits quite well the observed properties of Type Ia supernovae. Nevertheless, the light curves and the velocities measured at maximum are very homogeneous and the diversity introduced by igniting at different densities is not enough to account for the most extreme cases observed. It is also shown that a promising way out of this problem could be the He-induced detonation of white dwarfs with different masses. Finally, we outline that the location of the border line which separetes explosion from collapse strongly depends on the input physics adopted.

scholarly journals Two-Step Solvent Extraction of Radioactive Elements and Rare Earths from Estonian Phosphorite Ore Using Nitrated Aliquat 336 and Bis(2-ethylhexyl) Phosphate

Minerals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 388
Author(s):  
Silvester Jürjo ◽  
Liis Siinor ◽  
Carolin Siimenson ◽  
Päärn Paiste ◽  
Enn Lust
Keyword(s):  
Rare Earth ◽  
Solvent Extraction ◽  
Rare Earth Elements ◽  
Toxic Elements ◽  
Downstream Processing ◽  
Liquid Extraction ◽  
Aliquat 336 ◽  
Radioactive Elements ◽  
Improved Method ◽  
Ph Values

Estonian phosphorite ore contains trace amounts of rare earth elements (REEs), many other d-metals, and some radioactive elements. Rare earth elements, Mo, V, etc. might be economically exploitable, while some radioactive and toxic elements should be removed before any other downstream processing for environmental and nutritional safety reasons. All untreated hazardous elements remain in landfilled waste in much higher concentration than they occur naturally. To resolve this problem U, Th, and Tl were removed from phosphorite ore at first using liquid extraction. In the next step, REE were isolated from raffinate. Nitrated Aliquat 336 (A336[NO3]) and Bis(2-ethylhexyl) Phosphate (D2EHPA) were used in liquid extraction for comparison. An improved method for exclusive separation of radioactive elements and REEs from phosphorite ore in 2-steps has been developed, exploiting liquid extraction at different pH values.

scholarly journals THE ACTION OF RADIUM EMANATION ON LIPASE

1913 ◽  
Vol 16 (3) ◽  
pp. 379-384
Author(s):  
E.K. Marshall ◽  
L.G. Rowntree
Keyword(s):  
Radium Emanation

The Use of Radioactive Elements. I

1955 ◽  
Vol 75 (8) ◽  
pp. 1014-1016 ◽  
Author(s):  
Risaburo Nakai ◽  
Michiyasu Sugii ◽  
Hajime Tomono
Keyword(s):  
Radioactive Elements
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