radioactive shielding
91Plutonium in the environment — is an article which is part of the actinides in the environment series. Almost all plutonium present in the environment is due to human activity because the majority of plutonium isotopes are shortlived on a geological timescale.… …
92moon — mooner, n. moonless, adj. /moohn/, n. 1. the earth s natural satellite, orbiting the earth at a mean distance of 238,857 miles (384,393 km) and having a diameter of 2160 miles (3476 km). 2. this body during a particular lunar month, or during a… …
93Moon — /moohn/, n. Sun Myung /sun myung/, born 1920, Korean religious leader: founder of the Unification Church. * * * Sole natural satellite of Earth, which it orbits from west to east at a mean distance of about 238,900 mi (384,400 km). It is less… …
94nitrogen group element — ▪ chemical elements Introduction any of the chemical elements that constitute Group Va of the periodic table (see Figure >). The group consists of nitrogen (N), phosphorus (P), arsenic (As), antimony (Sb), and bismuth (Bi). The elements share… …
95Radium — The celebrated radioactive element discovered by Marie and Pierre Curie in 1898. * * * A metallic element, atomic no. 88, extracted in very minute quantities from pitchblende; 226Ra, its longest lived isotope, is produced as an intermediate in… …
96Cobalt — This article is about the metal. For other uses, see Cobalt (disambiguation). iron ← cobalt → nickel ↑ Co ↓ Rh …
97Helium — otherusesHelium (He) is a colorless, odorless, tasteless, non toxic, inert monatomic chemical element that heads the noble gas group in the periodic table and whose atomic number is 2. Its boiling and melting points are the lowest among the… …
98Atomic battery — The terms atomic battery, nuclear battery, tritium battery and radioisotope generator are used to describe a device which uses the emissions from a radioactive isotope to generate electricity. Like nuclear reactors they generate electricity from… …
99Fluorodeoxyglucose — Chembox new Name = Fluorodeoxyglucose ImageFile = Fluorodeoxyglucose.png ImageName = IUPACName = 2 Deoxy 2 fluoro D glucose OtherNames = 2 Fluoro 2 deoxy D glucose FDG Section1 = Chembox Identifiers CASOther = 29702 43 0 63503 12 8 ( 18F) SMILES …
100Nuclear reactor physics — See also: Critical mass Nuclear reactor physics is the branch of science that deals with the study and application of chain reaction to induce controlled rate of fission for energy in reactors. Most nuclear reactors use a chain reaction to induce …
