Advertising in video games consider such advertisements to make up a category of their own. In-game advertising is similar to subtle advertising in films, where the advertising content is within the "world" of the movie. Thus billboards, storefronts, posters, apparel, vehicles, weapons, fliers, sponsored product placement, and the interplay between the player and these elements in the game allow for a great degree of virtual advertisement. Examples include billboards advertising for (and product placement of) Bawls energy drink in "", and billboards for Adidas sportswear in "FIFA International Soccer". The principal advantage of product placement in in-games advertising is visibility and notoriety. For advertisers
Commonly used gamma-emitting isotopes Commonly used gamma-emitting isotopes Radionuclides which emit gamma radiation are valuable in a range of different industrial, scientific and medical technologies. This article lists some common gamma-emitting radionuclides of technological importance, and their properties. Many artificial radionuclides of technological importance are produced as fission products within nuclear reactors. A fission product is a nucleus with approximately half the mass of a uranium or plutonium nucleus which is left over after such a nucleus has been "split" in a nuclear fission reaction. Caesium-137 is one such radionuclide. It has a half-life of 30 years, and decays by pure beta decay to