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DOE-HDBK-XXXX-2005
06/30/2005
"Contact-handled transuranic waste" means transuranic waste with a surface dose rate not
greater than 200 millirem per hour. [WIPP LWA]
(See remote-handled waste.)
43. CRITERIA POLLUTANT. An air pollutant that is regulated by National Ambient Air Quality
Standards (NAAQS). The Environmental Protection Agency must describe the characteristics
and potential health and welfare effects that form the basis for setting, or revising, the standard
for each regulated pollutant. Criteria pollutants include sulfur dioxide, nitrogen dioxide, carbon
monoxide, ozone, lead, and two size classes of particulate matter, less than 10 micrometers
(0.0004 inch) in diameter, and less than 2.5 micrometers (0.0001 inch) in diameter. New
pollutants may be added to, or removed from, the list of criteria pollutants as more information
becomes available. (See National Ambient Air Quality Standards.)
Note: Sometimes pollutants regulated by state laws are also called criteria pollutants.
[Derived from EPA Terms]
44. CRITICAL HABITAT. Habitat essential to the conservation of an endangered or threatened
species that has been designated as critical by the U.S. Fish and Wildlife Service or the
National Marine Fisheries Service following the procedures outlined in the Endangered
Species Act and its implementing regulations (50 CFR 424). (See endangered species and
threatened species.)
The lists of Critical Habitats can be found in 50 CFR 17.95 (fish and wildlife), 50 CFR 17.96
(plants), and 50 CFR 226 (marine species).
[Derived from 50 CFR 402.02, 50 CFR 424.02(d)]
45. CRITICAL ORGAN. The body organ receiving a radionuclide or radiation dose that would
result in the greatest overall damage to the body. Specifically, that organ in which the dose
equivalent would be most significant due to a combination of the organ's radiological
sensitivity and the dose distribution throughout the body. [Derived from HPRH, ANSI N1.1]
46. CRITICALITY. The condition in which a system is capable of sustaining a nuclear chain
reaction. [Derived from DOE 6430.1A, DOE 5480.30, DOE Glossary]
Chain reaction: A reaction that initiates its own repetition. In nuclear fission, a chain reaction
occurs when a neutron induces a nucleus to fission and the fissioning nucleus releases one or
more neutrons which induce other nuclei to fission. [Derived from UI]
Critical Mass: The smallest mass of fissionable material that will support a self-sustaining
nuclear chain reaction. [Derived from UI]
A-11


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