7440-12-2 Usage
Uses
Used in Energy Industry:
Promethium-147 is used as an energy source for nuclear-powered batteries, providing a reliable and long-lasting power supply for various devices and equipment.
Used in Manufacturing Industry:
Promethium-147 serves as a beta-particle source for thickness gauges, which are essential tools for measuring the thickness of materials in various industrial processes.
Used in Self-luminous Compounds:
Promethium is utilized in the preparation of self-luminous compounds, which are used in various applications such as emergency exit signs, watch dials, and other devices that require illumination without an external power source.
Used in Medical and Scientific Research:
Promethium-147 is used as a portable X-ray source, which is valuable for medical and scientific research, as well as for non-destructive testing in various industries.
Used in Watchmaking Industry:
Promethium-147 is used in the manufacture of luminescent paint for watch dials, providing a long-lasting and easily visible illumination in low-light conditions.
Used in Radiation Source Applications:
Promethium-147 is also a source of beta rays, which have various applications in medicine, industry, and research, such as radiation therapy, sterilization, and material analysis.
History
The discovery of this element is credited to J.A. Marinsky and L.E. Glendenin who, in 1945, identified its long-lived isotope Pm-147 (t1/2 2.64 years) in the fission products of uranium. They named the element after Prometheus, who according to Greek mythology stole fire from heaven. The element was first isolated from fission product wastes by G.W. Parker and P.M. Lantz in 1948. It first was recovered from natural sources by O. Erametsa in 1965. An amount less than 0.5 g was recovered from 20 tons of rare earths.Promethium does not occur in metallic form in nature. Minute quantities are associated with other rare earths. It also is detected in uranium fission products. It is probably the rarest of the lanthanide elements.Promethium has very limited applications. It is used in phosphor lights to produce signals. Also, it is used as a beta particle source for thickness gages, nuclear batteries, and portable x-ray units.
Production Methods
Promethium-147, the isotope used commercially, is isolated from fission product wastes. The radioactive materials must be handled safely in a glove box. The metal complexes either with ethlenediaminetetraacetic acid (EDTA) or diethylenetriaminepentaacetic acid (DTPA) and is isolated by elution from Dowex 50.The metal may be obtained from its fluoride salt, promethium(III) fluoride by heating with lithium metal in a double tantalum crucible at 700 to 800°C in vacuum and then increasing the temperature to 1,100°C.
Check Digit Verification of cas no
The CAS Registry Mumber 7440-12-2 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, 1 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 7440-12:
(6*7)+(5*4)+(4*4)+(3*0)+(2*1)+(1*2)=82
82 % 10 = 2
So 7440-12-2 is a valid CAS Registry Number.
InChI:InChI=1/Pm
