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Natural hafnium (72 Hf) consists of five observationally stable isotopes (176 Hf, 177 Hf, 178 Hf, 179 Hf, and 180 Hf) and one very long-lived radioisotope, 174 Hf, with a half-life of 3.8 × 10 16 years. [2] In addition, there are 34 known synthetic radioisotopes, the most stable of which is 182 Hf with a half-life of 8.9 × 10 6 years.
Savannah River Laboratory was certified as a national laboratory on May 7, 2004. [ 2 ] SRNL research topics include environmental remediation , technologies for the hydrogen economy , handling of hazardous materials and technologies for prevention of nuclear proliferation , vitrification of nuclear waste and in hydrogen storage .
An age equation is set up for every radiometric dating technique to describe the mathematical relationship of the number of parent and daughter nuclide. [4] In Lu–Hf system, the parent would be Lu (the radioactive isotope) and Hf as the daughter nuclide (the product after radioactive decay). [3] [4] The age equation to Lu–Hf system is as ...
Allegany Ballistics Laboratory (ABL) located in Rocket Center, West Virginia, is a diverse industrial complex employing some 1,000 people across 1,628 acres (6.59 km 2).The facility is a member of the Federal Laboratory Consortium and is operated by Northrop Grumman (former Alliant Techsystems) under contract with the Naval Sea Systems Command (NAVSEA).
The laboratory shifted to its present location in Ramanthapur in 1982. The laboratory is situated in the vicinity of the Osmania University institutional area. Among other scientific examination facilities the laboratory provides the facilities for Explosives, Ballistics, Narcotics, Physics, Toxicology, Biology, Chemistry, Documents DNA ...
Fluoroantimonic acid is the strongest superacid based on the measured value of its Hammett acidity function (H 0), which has been determined for various ratios of HF:SbF 5. The H 0 of HF is −15. [5] A solution of HF containing 1 mol % of SbF 5 is −20. The H 0 is −21 for 10 mol%. For > 50 mol % SbF 5, the H 0 is between −21 and −23.
The ARL was established in 1945 by the U.S. Navy when the Harvard Underwater Sound Laboratory (USL) was terminated and its torpedo division was moved to Penn State. Eric Walker, the USL's assistant director, moved to Penn State to become its first director from 1945 until 1951, when he became the president of the university.
PhN=N-N(CH 2) 5 + 2 HF → PhF + N 2 + [(CH 2) 5 NH 2]F. Historical note: in Wallach's era, the element fluorine was symbolized with "Fl". Thus, his procedure is subtitled "Fluorbenzol, C 6 H 5 Fl". [1] On the laboratory scale, PhF is prepared by the thermal decomposition of the benzenediazonium tetrafluoroborate: PhN 2 BF 4 → PhF + BF 3 + N 2