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DOE-HDBK-1188-2006
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:
Because pH is the negative logarithm of the hydrogen ion (H+) concentration, each unit 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]
A-27


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