radioactivity determination

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• Environmental radioactivity — is produced by radioactive materials in the human environment. While some radioisotopes, such as strontium 90 (90Sr) and technetium 99 (99Tc), are only found on Earth as a result of human activity, and some, like potassium 40 (40K), are only… …   Wikipedia

• planchet — A small, flat plate or dish used to support a sample for radioactivity determination; the sample is usually evaporated on (in) the p.. [Fr. planchette, dim. of planche, plank] * * * plan·chet plan chət n a small metal disk or plate on which a… …   Medical dictionary

• dating — I In geology and archaeology, the process of determining an object s or event s place within a chronological scheme. Scientists may use either relative dating, in which items are sequenced on the basis of stratigraphic clues (see stratigraphy) or …   Universalium

• Partition coefficient — In chemistry and the pharmaceutical sciences, a partition (P) or distribution coefficient (D) is the ratio of concentrations of a compound in the two phases of a mixture of two immiscible solvents at equilibrium.[1] The terms gas/liquid partition …   Wikipedia

• List of Statutory Instruments of the United Kingdom, 1993 — This is a complete list of all 1844 Statutory Instruments published in the United Kingdom in the year 1993. NOTOC 1 100* Environmental Protection (Controls on Injurious Substances) Regulations 1993 S.I. 1993/1 * Rail Crossing Extinguishment and… …   Wikipedia

• List of Statutory Instruments of the United Kingdom, 1994 — This is a complete list of all 1851 Statutory Instruments published in the United Kingdom in the year 1994. NOTOC 1 100* Public Telecommunication System Designation (Vodafone Limited) Order 1994 S.I. 1994/1 * Oxfordshire County Council (Shifford… …   Wikipedia

• List of Statutory Instruments of the United Kingdom, 1995 — This is a complete list of all 1,872 Statutory Instruments published in the United Kingdom in the year 1995. NOTOC 1 100* National Health Service (Optical Charges and Payments) (Scotland) Amendment Regulations 1995 S.I. 1995/1 * Plymouth… …   Wikipedia

• physical science — physical scientist. 1. any of the natural sciences dealing with inanimate matter or with energy, as physics, chemistry, and astronomy. 2. these sciences collectively. [1835 45] * * * Introduction       the systematic study of the inorganic world …   Universalium

• rare-earth element — /rair errth /, Chem. any of a group of closely related metallic elements, comprising the lanthanides, scandium, and yttrium, that are chemically similar by virtue of having the same number of valence electrons. Also called rare earth metal. [1955 …   Universalium

• x-ray — /eks ray /, n. Also, x ray, X ray. 1. Physics. a. Often, x rays. a form of electromagnetic radiation, similar to light but of shorter wavelength and capable of penetrating solids and of ionizing gases. b. such radiation having wavelengths in the… …   Universalium

• Theoretical astronomy — Nucleosynthesis Stellar nucleosynthesis Big Bang nucleosynthesis Supernova nucleosynthesis Cosmic ray spallation …   Wikipedia