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As a rare-earth element, thulium-170 can be used as the pure metal or thulium hydride, but most commonly thulium oxide due to the refractory properties of that compound. [5] [6] The isotope can be prepared in a medium-strength reactor by neutron irradiation of natural thulium, which has a high neutron capture cross section of 103 barns.
Naturally occurring thulium (69 Tm) is composed of one stable isotope, 169 Tm (100% natural abundance).Thirty-nine radioisotopes have been characterized, with the most stable being 171 Tm with a half-life of 1.92 years, 170 Tm with a half-life of 128.6 days, 168 Tm with a half-life of 93.1 days, and 167 Tm with a half-life of 9.25 days.
Thulium-169 is thulium's only primordial isotope and is the only isotope of thulium that is thought to be stable; it is predicted to undergo alpha decay to holmium-165 with a very long half-life. [10] [22] The longest-lived radioisotopes are thulium-171, which has a half-life of 1.92 years, and thulium-170, which has a
thulium-168: 93.1 8.04 fermium-257: 100.5 8.68 thulium-170: 128.6 11.11 polonium-210: 138.376 11.9557 calcium-45: 162.7 14.06 curium-242: 162.8 14.07 gold-195: 186.1 16.08 gadolinium-153: 240.4 20.77 zinc-65: 243.7 21.06 cobalt-57: 271.79 23.483 einsteinium-254: 275.7 23.82 vanadium-49: 330 29 berkelium-249: 330 29 californium-248: 333.5 28.81 ...
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The site is primarily built for weapons-grade plutonium production, but also produces weapons-usable tritium, polonium-210, and uranium-233, as well as non-military plutonium, thulium-170, and iridium-192. [27] [40] On September 27, the first instance of xenon poisoning occurs in the Hanford B reactor.
The TM 170 was originally developed by Thyssen Henschel which subsequently became part of Rheinmetall Landsystem. Today, the TM-170 is considered a legacy product of Rheinmetall MAN Military Vehicles, part of Rheinmetall's Vehicle Systems Division. The equivalent vehicle in the current RMMV portfolio is the Survivor R.
Natural ytterbium is composed of seven stable isotopes: 168 Yb, 170 Yb, 171 Yb, 172 Yb, 173 Yb, 174 Yb, and 176 Yb, with 174 Yb being the most common, at 31.8% of the natural abundance). Thirty-two radioisotopes have been observed, with the most stable ones being 169 Yb with a half-life of 32.0 days, 175 Yb with a half-life of 4.18 days, and ...