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97m Tc is the most stable, with a half-life of 91.0 days (0.097 MeV). [4] This is followed by 95m Tc (half-life: 61 days, 0.038 MeV) and 99m Tc (half-life: 6.04 hours, 0.143 MeV). 99m Tc only emits gamma rays, subsequently decaying to 99 Tc. [7] For isotopes lighter than 98 Tc, the primary decay mode is electron capture to isotopes of molybdenum.
Uniform polyhedra can be divided between convex forms with convex regular polygon faces and star forms. Star forms have either regular star polygon faces or vertex figures or both. This list includes these: all 75 nonprismatic uniform polyhedra; a few representatives of the infinite sets of prisms and antiprisms;
The Fender TC-90 was produced in Vintage White (from 04/2004 – 10/2007) and Black Cherry Burst (from 05/2004 – 09/2007), with around 700 made of each color. In 2007 the TC-90 was revised and became the JA-90, the signature model for Jim Adkins , the singer/guitarist of Jimmy Eat World .
The word is a portmanteau of the words thin and insulate, trademarked by 3M. [1] The material is made by the 3M Corporation and was first sold in 1979. [2] It was originally marketed as an inexpensive alternative to down; at the time, 3M claimed it was twice as warm as an equivalent amount of any natural material. [3] [4]
A spherical polygon is a polygon on the surface of the sphere. Its sides are arcs of great circles —the spherical geometry equivalent of line segments in plane geometry . Such polygons may have any number of sides greater than 1.
The TC-90s and the UC-90 are operated by the 202nd Naval Air Training Squadron (JMSDF) based at Tokushima Air Base, while the LC-90s are attached to various Lockheed P-3 Kokutai (Squadrons) and Air Transport Squadron 61 [19] as liaison aircraft. In late 2005, the JMSDF marked 500,000 accident-free flying hours of the TC-90 trainer fleet.
Technetium-99 (99 Tc) is an isotope of technetium which decays with a half-life of 211,000 years to stable ruthenium-99, emitting beta particles, but no gamma rays. It is the most significant long-lived fission product of uranium fission, producing the largest fraction of the total long-lived radiation emissions of nuclear waste .
c = 439.90 pm (at 20 °C) [2] ... Technetium is a chemical element; it has symbol Tc and atomic number 43. It is the lightest element whose isotopes are all radioactive.