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|  DOE-HDBK-XXXX-2005
06/30/2005
132. PERFORMANCE ASSESSMENT. In general:
An analysis that predicts the behavior of a system or system component under a given set of
conditions. [Derived from 10 CFR 960.2]
In the context of DOE waste management activities:
A systematic analysis of the potential risks posed by waste management systems to the public
and environment, and a comparison of those risks to established performance objectives.
[Derived from DOE 5820.2A]
As defined in EPA regulation 40 CFR 191.12:
An analysis that: (1) identifies the processes and events that might affect the disposal system;
(2) examines the effects of these processes and events on the performance of the disposal
system; and (3) estimates the cumulative releases of radionuclides, considering the associated
uncertainties, caused by all significant processes and events. [Derived from 40 CFR 191.12]
133. PERSON-REM. A unit of collective radiation dose applied to populations or groups of
individuals (see collective dose); that is, a unit for expressing the dose when summed across all
persons in a specified population or group. One person-rem equals 0.01 person-sieverts (Sv).
[Derived from BEIR III 10 CFR 835.2]
134. PH. A measure of the relative acidity or alkalinity of a solution, expressed on scale from 0 to
14, with the neutral point at 7.0. Acid solutions have pH values lower than 7.0, and basic (i.e.,
alkaline) solutions have pH values higher than 7.0.
Where further discussion would be helpful, add:
increase in pH value expresses a change of state of 10 times the preceding state. Thus, pH 5 is
10 times more acidic than pH 6, and pH 9 is 10 times more alkaline than pH 8.
[Derived from ESTD, EE&S]
135. PICOCURIE. One trillionth (10-12) of a curie. (See curie.)
136. PIT. The core element of a nuclear weapon's "primary" or fission component. The pit contains
a potentially critical mass of fissile material, such as plutonium-239 or highly enriched
uranium, arranged in a subcritical geometry and surrounded by some type of casing. [Derived
from DOE O 452.1A, DOE O 452.2A,]
137. PLUME. The elongated volume of contaminated water or air originating at a pollutant source
such as an outlet pipe or a smokestack. A plume eventually diffuses into a larger volume of
less contaminated material as it is transported away from the source. [Derived from EPA
Terms]
138. PLUTONIUM. A heavy, radioactive, metallic element with the atomic number 94. It is
A-27
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