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Introduction and Occurrence of the Actinides

Apart from thorium, protactinium, and uranium, the actinides are obtained by a bombardment process of some kind. Thus for actinium (and also protactinium)  [Pg.145]

Lanthanide and Actinide Chemistry S. Cotton 2006 John Wiley Sons, Ltd. [Pg.145]

For elements beyond plutonium, successive neutron capture is required. This is, obviously. [Pg.146]

The limit of this process in a reactor is the product of the next neutron absorption is [Pg.146]

which undergoes spontaneous fission (ti = 0.38 ms). This point can be passed in two ways. One is to utilize a more intense neutron flux than can be obtained in a reactor, in the form of a thermonuclear explosion, so that a product such as undergoes further neutron absorption before fission can occur. Here, in the synthesis of Fmin Tvy Mike , the world s first thermonuclear test, atEniwetok atoll on 1st November 1952, the initial product of multiple neutron capture, underwent a whole series of rapid decays, yielding Fm. [Pg.146]


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