radioactivity )

Iodine-123 may be the preferred radionuclide in some clinics due to its more favourable radiation dosimetry ( i. e. less radiation dose to the patient per unit administered radioactivity ) and a gamma photon energy more amenable to imaging with the gamma camera.

These mantles glow with an intense white light ( unrelated to radioactivity ) when heated in a gas flame, and its color could be shifted to yellow by addition of cerium.

* Geiger Counter ( measures radioactivity ) invented by Hans Geiger in 1908

It is likely that the fissile material of an old bomb which is due for refitting will contain decay products of the plutonium isotopes used in it, these are likely to include U-236 from Pu-240 impurities, plus some U-235 from decay of the Pu-239 ; due to the relatively long half-life of these Pu isotopes, these wastes from radioactive decay of bomb core material would be very small, and in any case, far less dangerous ( even in terms of simple radioactivity ) than the Pu-239 itself.

Whatever view of science and the sociology of scientific knowledge is correct, it is a fact that in the history of science there have been many instances of new theories ( e. g., germ theory of disease, finitude of the speed of light, radioactivity ) being ridiculed and shunned by the greater scientific community when first proposed or discovered, only later to be adopted as more probably accurate.

Proton emission ( also known as proton radioactivity ) is a type of radioactive decay in which a proton is ejected from a nucleus.

A useful compound is one that is used either for the medical imaging of certain body parts or tumors ( at low doses of radioactivity ) or treating tumors ( at high doses of radioactivity ).

Cluster decay ( also named heavy particle radioactivity or heavy ion radioactivity ) is a type of nuclear decay in which a parent atomic nucleus with A nucleons and Z protons emits a cluster of N < sub > e </ sub > neutrons and Z < sub > e </ sub > protons heavier than an alpha particle but lighter than a typical binary fission fragment ( although ternary fission into three fragments produces products which overlap cluster decay ).

* ( radioactivity ) radioactive decay