7440-34-8 Usage
Description
Actinium is a silvery metal with a cubic crystal structure, characterized by its melting point at 1,051°C and vaporization point at 3,198°C. It has a density of 10.0 g/cm3. Actinium-227, a radioactive isotope, occurs in uranium ore as a decay product of uranium-235 and is found in equilibrium with its decay products. The element was discovered independently by A. Debierne and F. Giesel in 1899 and 1902, respectively. Chemically, the metal is produced by reducing actinium fluoride with lithium vapor at temperatures ranging from 1,100°C to 1,300°C.
Uses
Used in Nuclear Industry:
Actinium is used as a source of neutrons in nuclear reactors for various applications, such as initiating and sustaining nuclear fission reactions. Its radioactivity and ability to emit neutrons make it a valuable material in the field of nuclear energy and research.
History
The name Actinium derives from the Greek, aktis or akinis for “beam or ray” because in equilibrium with its decay products, actinium is a powerful source of alpha radiation. The discovery has been credited to the French chemist Andre-Louis Debierne in 1899. It was independently discovered by German chemist Friedrich Oskar Giesel in 1902, who called it emanium. It is thought that Debierne’s original preparation actually consisted of two thorium isotopes, 227Th and 230Th, but there was confusion in those early discoveries in radioactivity and Debierne’s claim prevailed and his name of actinium has been retained to this day. The longest half-life associated with this unstable element is 21.77 year 227Ac.
Reactions
Actinium behaves like lanthanum forming mostly the trivalent salts of the metal. It is strongly electropositive, the first ionization potential being 5.17eV. Reacts with HCl forming AcCl3; also reacts with organic acids forming corresponding salts; combustion in air can produce oxide and nitride; susceptible to react with CO2 forming carbonate.
Hazard
Toxicity: Exposure to radiation can cause cancer.
Check Digit Verification of cas no
The CAS Registry Mumber 7440-34-8 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 7,4,4 and 0 respectively; the second part has 2 digits, 3 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 7440-34:
(6*7)+(5*4)+(4*4)+(3*0)+(2*3)+(1*4)=88
88 % 10 = 8
So 7440-34-8 is a valid CAS Registry Number.