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DOE-HDBK-1188-2006
47. CUMULATIVE IMPACTS. Impacts on the environment that result when the incremental impact of
a proposed action is added to the impacts from other past, present, and reasonably foreseeable future
actions regardless of what agency (Federal or non-Federal) or person undertakes the other actions.
Cumulative impacts can result from individually minor but collectively significant actions taking place
over a period of time. [Derived from 40 CFR 1508.7]
48. CURIE (CI). A unit of radioactivity equal to 37 billion disintegrations per second (i.e., 37 billion
becquerels); also a quantity of any radionuclide or mixture of radionuclides having 1 curie of
radioactivity. [Derived from HPRH, NCRP 51, 10 CFR 20.1005]
49. DECAY, RADIOACTIVE. The decrease in the amount of any radioactive material with the passage
of time, due to spontaneous nuclear disintegration (i.e., emission from atomic nuclei of charged
particles, photons, or both). [Derived from RHH, HPRH, NRC Glossary]
50. DECIBEL. A unit for expressing the relative intensity of sounds on a logarithmic scale from zero for
the average least perceptible sound to about 130 for the average level at which sound causes pain to
humans. For traffic and industrial noise measurements, the A-weighted decibel (dBA), a frequency-
weighted noise unit, is widely used. The A-weighted decibel scale corresponds approximately to the
frequency response of the human ear and thus correlates well with loudness. [Derived from EPA
Glossary, ESTD]
51. DEPLETED URANIUM. Uranium whose content of the fissile isotope uranium-235 is less than the
0.7 percent (by weight) found in natural uranium, so that it contains more uranium-238 than natural
uranium. (See uranium and natural uranium.)
Where relevant to a particular NEPA document, add:
Depleted uranium generally is derived from residues of uranium isotope separation; some is derived
from spent nuclear fuel.
[Derived from 10 CFR 71, 49 CFR 173.403, NRC Glossary, MH]
52. DESIGN BASIS ACCIDENT. An accident postulated for the purpose of establishing functional and
performance requirements for safety structures, systems, and components. [DOE G 420.1-X (see
DOE-STD-3009-94)]
53. DETECTOR. A device used to convert the energy of incident radiation into another form (such as
light, an electrical signal, or a trace in a chemical emulsion) in order to observe or measure radiation.
[Derived from PD, ANSI N42.18]
A particle detector is any device used to sense the passage of atomic or subatomic particles or to
measure their properties. For many particle detectors, this involves observing and measuring the
radiation (electromagnetic or ionizing) released as particles interact with a gaseous, liquid, or solid
medium or an electromagnetic field. The term also may refer to a collection of particle detection
A-12


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