- Industri: Government
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United States Department of Health and Human Services, Radiation Emergency Medical Management
The initial kinetic energy of the primary ionizing particles (photoelectrons, compton electrons, positron/negatron pairs from photon radiation, and scattered nuclei from fast neutrons) produced by the interaction of the incident uncharged radiation in a small volume of air, when it is irradiated by an x-ray beam. Unit of measure is gray. See also kerma.
Industry:Medical devices
Means making every reasonable effort to maintain exposures to ionizing radiation as far below the dose limits as practical. This is a key principle in radiation protection and safety.
Industry:Medical devices
(image) the nucleus of a helium atom, made up of two neutrons and two protons with a charge of +2. Certain radioactive nuclei emit alpha particles. Alpha particles generally carry more energy than gamma rays or beta particles, and deposit that energy very quickly while passing through tissue. Alpha particles can be stopped by a thin layer of light material, such as a sheet of paper, and cannot penetrate the outer, dead layer of skin. Therefore, they do not damage living tissue when outside the body. When alpha-emitting atoms are inhaled or swallowed, however, they are especially damaging because they transfer relatively large amounts of ionizing energy to living cells. See also beta particles, gamma rays, neutron, x-ray.
Industry:Medical devices
A silvery metal; it is a man-made element whose isotopes am-237 through am-246 are radioactive. Am-241 is formed spontaneously by the beta decay of plutonium-241. Trace quantities of americium are widely used in smoke detectors and as neutron sources in neutron moisture gauges.
Industry:Medical devices
Assigned protection factor (apf) means the workplace level of respiratory protection that a respirator or class of respirators is expected to provide to employees enrolled in a continuing, effective respiratory protection program. (source: assigned protection factors for the revised respiratory protection standard, 2009. Osha. U.s. department of labor publication no. 3352-02 2009.)
Industry:Medical devices
The smallest particle of an element that can enter into a chemical reaction.
Industry:Medical devices
1 amu is equal to one twelfth of the mass of a carbon-12 atom.
Industry:Medical devices
The total number of protons and neutrons in the nucleus of an atom.
Industry:Medical devices
