Search results
Results from the WOW.Com Content Network
The metastable technetium-99m (99m Tc) is a short-lived (half-life about 6 hours) nuclear isomer used in nuclear medicine, produced from molybdenum-99. It decays by isomeric transition to technetium-99, a desirable characteristic, since the very long half-life and type of decay of technetium-99 imposes little further radiation burden on the body.
Technetium-99 (99 Tc) is a major product of the fission of uranium-235 (235 U), making it the most common and most readily available isotope of technetium. One gram of technetium-99 produces 6.2 × 10 8 disintegrations per second (in other words, the specific activity of 99 Tc is 0.62 G Bq /g).
Technetium-99m (99m Tc) is a metastable nuclear isomer of technetium-99 (itself an isotope of technetium), symbolized as 99m Tc, that is used in tens of millions of medical diagnostic procedures annually, making it the most commonly used medical radioisotope in the world.
99 Mo: 65.94 h: Its daughter nuclide 99m Tc is important in medical diagnosing. 6.0899%: Caesium: 137 Cs: 30.17 y: Source of most of the decay heat from years to decades after irradiation, together with 90 Sr. 6.0507%: Technetium: 99 Tc: 211 ky: Candidate for disposal by nuclear transmutation. 5.7518%: Strontium: 90 Sr: 28.9 y: Source of much ...
In 1959–1961 Great Britain Atomic Energy Authority produced 125 g of 99.9% pure protactinium at a cost of $ 500 000, giving the cost of 4 000 000 USD per kg. [44] Periodic Table of Elements at Los Alamos National Laboratory website at one point listed protactinium-231 as available from Oak Ridge National Laboratory at a price of 280 000 USD/kg.
technetium-99: 211.1 6.66 krypton-81: 229 7.2 tin-126: 230 7.3 uranium-234: 245.5 7.75 chlorine-36: 301 9.5 selenium-79: 327 10.3 curium-248: 348 11.0 bismuth-208: 368 11.6 plutonium-242: 375 11.8 aluminium-26: 717 22.6 10 6 years 10 12 seconds beryllium-10: 1.39 44 zirconium-93: 1.53 48 gadolinium-150: 1.79 56 neptunium-237: 2.144 67.7 caesium ...
Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!
Technetium (43 Tc) is one of the two elements with Z < 83 that have no stable isotopes; the other such element is promethium. [2] It is primarily artificial, with only trace quantities existing in nature produced by spontaneous fission (there are an estimated 2.5 × 10 −13 grams of 99 Tc per gram of pitchblende) [3] or neutron capture by molybdenum.