Copied At Astatine
At Astatine
Astatine is - besides radon and francium - the only natural radioelement which only has short-Lived isotopes, thereby excluding experiments with . . weighable" amounts of the element. This implies that all available data on physics and chemistry of this element are 12 16 based on experiments on the tracer scale with 10- to 10- g - and this will also not change in future because no longer-Lived isotopes as yet known are to be expected. Due to the fact that the only isotope of At occurring in the natural decay series, 219At, results from the 0. 005% a-branching of 223Fr which itself is produced by the only 1. 38% a-branching of 227 Ac - a member of the 235U series - there is no chance to recover substantial amounts of 219At from natural sources for sCientific research of At. All studies, therefore, are being done with the isotopes 209At to 211At having half-lives in the few hours region and being obtained by irradiation of bismuth with a-particles via (a,xn) reactions or by proton irradiation of heavy elements via spallation reactions. The mostly used isotope is 7. 22 h 211At. The fast separation of the obtained At isotopes is no very difficult procedure and is either being done by wet adsorption-precipitation techniques or making use of its high volatility by destilling in air.
Price Comparison
| Seller | Contact Seller | List Price | On Sale | Shipping | Best Promo | Final Price | Volume Discount | Financing | Availability | Seller's Page |
|---|---|---|---|---|---|---|---|---|---|---|
|
BEST PRICE 1 Product Purchase
|
|
$84.99 | $84.99 |
|
$84.99 | See Site | In stock | Visit Store |
Reviews
Questions & Answers
Beginning PHP and MySQL
$54.99
Biometric Authentication
$39.99
Unruhige Stimmen
$119.99
Genetics of Diabetes Mellitus
$169.99
Semiotic Perception and Dynamic Forms of Meaning
$99.00
The Baby-Sitters Club: Jessi and the Superbrat
$5.99
Electromagnetic Theory
$169.99
56. Jahrestagung der Deutschen Gesellschaft fr Unfallchirurgie e.V
$59.99
Proceedings of the 2nd International Conference on Innovative Materials, Manufacturing, and Advanced
$219.99
Soziale Arbeit fr den aktivierenden Staat
$64.99
Wahrscheinlichkeitstheorie
$49.99
Algorithmic Number Theory
$39.99
Energie, kologie und Unvernunft
$29.99
Zinc in Human Biology
$54.99
Cycle Spaces of Flag Domains
$139.99
Optical Switching
$169.99
Die EU zwischen einheitlicher und differenzierter Integration
$39.99
Computer-Aided Analysis of Rigid and Flexible Mechanical Systems
$39.99
Sulfate-Reducing Bacteria
$249.99
Seminar on Stochastic Processes, 1992
$109.99
Annual Report on Chinas Petroleum, Gas and New Energy Industry (2021)
$149.00
Minimally Invasive Gynecological Surgery
$109.99
Pediatric and Adolescent Sports Traumatology
$159.00
Totales Cash-flow-System und Finanzfluverfahren
$59.99
Chinese Sociology
$64.99
Vibrational (Infrared and Raman) Spectra of Minerals and Related Compounds
$299.99
Oropharyngeal Dysphagia
$99.99
Hong Kong Politics
$79.99
Global Migration
$39.99
The Central and East European Population since 1850
$799.99
Real Voices
$109.99
Adult Mortality in India: Trends, Socio-economic Disparities and Consequences
$99.00
Individuelle und strukturierte Formen der Promotion
$49.99
Kleine Baustatik
$29.99
Rapid Damage-Free Robotic Harvesting of Tomatoes
$84.99
Calcium-Sensing Receptor
$84.99
Plastids
$219.99
Lagrangian Floer Theory and Its Deformations
$99.99
Das sterreichische Bergschadenrecht unter Bercksichtigung des deutschen Bergrechtes
$59.99
Recent Advances in Manufacturing and Thermal Engineering
$249.99
