scholarly journals Annual variations of the 214Po, 213Po and 212Po half-life values

2020 ◽  
Vol 1690 ◽  
pp. 012029
Author(s):  
E N Alexeev ◽  
A M Gangapshev ◽  
Yu M Gavrilyuk ◽  
A M Gezhaev ◽  
V V Kazalov ◽  
...  
Keyword(s):  
Half Life ◽  
Annual Variations ◽  
Life Values

Half-lives of spherical proton emitters within the framework of fractional calculus

2014 ◽  
Vol 23 (09) ◽  
pp. 1450044 ◽  
Author(s):  
Abdullah Engin Çalik ◽  
Hüseyin Şirin ◽  
Hüseyin Ertik ◽  
Buket Öder ◽  
Mürsel Şen
Keyword(s):  
Fractional Calculus ◽  
Fractional Derivative ◽  
Nuclear Structure ◽  
Caputo Fractional Derivative ◽  
Half Life ◽  
Nuclear Decay ◽  
Life Values ◽  
Derivative Order

In this paper, the half-life values of spherical proton emitters such as Sb , Tm , Lu , Ta , Re , Ir , Au , Tl and Bi have been calculated within the framework of fractional calculus. Nuclear decay equation, related to this phenomenon, has been resolved by using Caputo fractional derivative. The order of fractional derivative μ being considered is 0 < μ ≤ 1, and characterizes the fractality of time. Half-life values have been calculated equivalent with empirical ones. The dependence of fractional derivative order μ on the nuclear structure has also been investigated.

Surfactant metabolism of newborn lamb lungs studied in vivo

1980 ◽  
Vol 49 (6) ◽  
pp. 1091-1098 ◽  
Author(s):  
A. Jobe ◽  
M. Ikegami ◽  
I. Sarton-Miller ◽  
L. Barajas
Keyword(s):  
Palmitic Acid ◽  
Intravenous Injection ◽  
Half Life ◽  
Lamellar Body ◽  
Lung Parenchyma ◽  
Newborn Lamb ◽  
Specific Activities ◽  
Life Values ◽  
Surfactant Metabolism

Surfactant, microsomal, and lamellar body fractions were isolated from the lungs of 5-day-old lambs 0.21-55 h after the intravenous injection of radiolabeled palmitic acid. The specific activities as cpm/mumol phospholipid phosphate of phosphatidylcholine, saturated phosphatidylcholine, phosphatidylglycerol, and phosphatidylethanolamine were measured. The palmitate-labeled phospholipids disappeared from the lung parenchyma with a half-life of approximately 50 h. The radiolabel disappeared from phosphatidylcholine, saturated phosphatidylcholine, phosphatidylglycerol, and phosphatidylethanolamine of microsomal fractions with initial half-life values of 4.5, 4.6, 1.9, and 23.9 h, respectively. The labeled phospholipids rapidly appeared in the lamellar body fraction and accumulated in the surfactant of the lambs in a linear fashion for 35 h. The curves for the labeling of surfactant with radiolabeled saturated phosphatidylcholine, phosphatidylglycerol, and phosphatidylethanolamine were similar to the curve for phosphatidylcholine.

scholarly journals Radionuclide biological half-life values for terrestrial and aquatic wildlife

2015 ◽  
Vol 150 ◽  
pp. 270-276 ◽  
Author(s):  
N.A. Beresford ◽  
K. Beaugelin-Seiller ◽  
J. Burgos ◽  
M. Cujic ◽  
S. Fesenko ◽  
...  
Keyword(s):  
Half Life ◽  
Biological Half Life ◽  
Aquatic Wildlife ◽  
Life Values

scholarly journals Average and recommended half-life values for two neutrino double beta decay: upgrade-09

2009 ◽  
Author(s):  
A. S. Barabash ◽  
Osvaldo Civitarese ◽  
Ivan Stekl ◽  
Jouni Suhonen
Keyword(s):  
Beta Decay ◽  
Half Life ◽  
Double Beta Decay ◽  
Life Values

THE INTERPRETATION OF STEROID HALF-LIFE VALUES

1959 ◽  
Vol 19 (7) ◽  
pp. 854-856 ◽  
Author(s):  
ROBERT L. CRANNY ◽  
VINCENT C. KELLEY
Keyword(s):  
Half Life ◽  
Life Values

RATE OF PYROPHOSPHATE HYDROLYSIS IN ORGANIC SOILS

1985 ◽  
Vol 65 (3) ◽  
pp. 497-506 ◽  
Author(s):  
L. E. PARENT ◽  
A. F. MacKENZIE
Keyword(s):  
Half Life ◽  
Organic Soil ◽  
Ash Content ◽  
Enzymatic Activities ◽  
Organic Soils ◽  
Pyrophosphatase Activity ◽  
Life Values ◽  
Highly Correlated ◽  
Pyrophosphate Hydrolysis ◽  
Humic Soil

Twenty-four organic soil materials were selected in order to study pyrophosphatase activity and pyrophosphate retention and hydrolysis. The activation energy of pyrophosphate hydrolysis was 22 kJ∙mol−1 for virgin fibric soil materials and 33 kJ∙mol−1 for cultivated humic soil materials. Phosphatase and pyrophosphatase activities were highly correlated (r = 0.947**) and were promoted apparently by non-specific enzymes. Enzymatic activities varied from 11.6 to 148.1 mmol∙kg−1∙(2 h)−1, and were higher in virgin than in cultivated soil materials. Soil retention increased with an increase in ash content (r = 0.876**) and was apparently weak, as noted by complete pyrophosphate hydrolysis after 4–8 days of incubation. Half-life values of pyrophosphate incubated at room temperture varied from 0.1 to 3.7 days, and were highly correlated with enzymatic activities and levels of nonretained pyrophosphate. A regression model, involving an interaction between pyrophosphatase activity and level of nonretained pyrophosphate, accounted for 77% of the variation in log of half-life values of pyrophosphate in organic soil materials. Key words: Pyrophosphatase, phosphatase, pyrophosphate, half-life values, pyrophosphate retention

Half-life measurements on 29P and 33Cl

1970 ◽  
Vol 48 (13) ◽  
pp. 1578-1584 ◽  
Author(s):  
P. J. Scanlon ◽  
D. Crabtree
Keyword(s):  
Fourier Transform ◽  
Solid State ◽  
Half Life ◽  
Time Distribution ◽  
Transform Method ◽  
Solid State Detector ◽  
Life Values ◽  
The Fourier Transform ◽  
State Detector ◽  
Crystal Clock

The half-life values for the β+ emitters 29P and 33Cl reported in the literature show a wide variation (4.6 ± 0.2 to 4.19 ± 0.02 s for 29P and 2.9 ± 0.1 to 2.51 ± 0.02 s for 33Cl). We have remeasured these activities via the Si(p,γ)P and S(p,γ)Cl reactions with protons from a 3 MV Van de Graaff. The decay positrons were detected in a solid-state detector telescope and the time distribution of the pulses was determined with a multiscaler controlled by a crystal clock. Data were analyzed by an iterative least-squares procedure and by the Fourier transform method. Values obtained were 4.15 ± 0.03 s for 29P and 2.47 ± 0.02 s for 33Cl.

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