- 37 - (or a heavier isotope of hydrogen) and in the process energy is released as well as a vast number of neutrons. To accomplish fusion, temperatures of the order of a million degrees centigrade and heavy isotepes of hydrogen -- He, deuterium, or H, tritium -- are needed. The greatest amount of energy is produced when the ingredients are deuterium and tritium. Radioisotopes released to the environment from the detonation of a fusion device are tritium plus tritium and deuterium as debris and a varied assortment of induced radioisotopes. The induced radio- isotopes were originally stable isotopes that captured a neutron released during the fusion process or were imparted energy upon being hit by a neutron. The kinds of radio- isotopes produced by the detonation of a nuclear device depend upon the kinds of stable isotopes within range of the neutrons and the ability of the stable isotopes to capture a neutron, able. and therefore are not entirely predict- The radioisotopes produced by the fusion process generally have a shorter half life and are less hazardous than fission products. Following the development of the fission process and the fusion process, fission was used to provide the