Appendix A Glossary - doe-std-1128-98

DOE-STD-1128-98

APPENDIX A

GLOSSARY

abnormal situation: Unplanned event or condition that adversely affects, potentially affects or

indicates degradation in the safety, security, environmental or health protection performance or

operation of a facility. (RCS)

absorbed dose: The energy absorbed by matter from ionizing radiation per unit mass of

irradiated material at the place of interest in that material. The absorbed dose is expressed in units

of rad (or gray) (1 rad = 0.01 gray). (10 CFR 835)

activity median aerodynamic diameter: The diameter of a sphere having a density of 1 g cm-3

with the same terminal settling velocity in air as that of the aerosol particle whose activity is the

median for the entire aerosol. (Internal Dosimetry IG)

air sampling: A form of air monitoring in which an air sample is collected and analyzed at a later

time, sometimes referred to as retrospective air monitoring.

air monitoring: Actions to detect and quantify airborne radiological conditions by the collection

of an air sample and the subsequent analysis either in real-time or off line laboratory analysis of

the amount and type of radioactive material present in the workplace atmosphere. (Internal

Dosimetry IG)

airborne radioactive material: Radioactive material in any chemical or physical form that is

dissolved, mixed, suspended, or otherwise entrained in air.

airborne radioactivity area: Any area, accessible to individuals, where:

(1)

The concentration of airborne radioactivity, above natural background,

exceeds or is likely to exceed the derived air concentration (DAC) values

listed in appendix A or appendix C of this part; or

(2)

An individual present in the area without respiratory protection could

receive an intake exceeding 12 DAC-hours in a week. (10 CFR 835)

alarm set point: The count rate at which a continuous air monitor will alarm, usually set to

correspond to a specific airborne radioactive material concentration by calculating the sample

medium buildup rate.

ambient air: The general air in the area of interest (e.g., the general room atmosphere) as distinct

from a specific stream or volume of air that may have different properties.

annual limit on intake (ALI): The derived limit for the amount of radioactive material taken

into the body of an adult worker by inhalation or ingestion in a year. ALI is the smaller value of

intake of a given radionuclide in a year by the reference man (ICRP Publication 23) that would

result in a committed effective dose equivalent of 5 rem (0.05 sievert) or a committed dose

equivalent of 50 rem (0.5 sievert) to any individual organ or tissue. ALI values for intake by

ingestion and inhalation of selected radionuclides are based on Table 1 of the U.S. Environmental

Protection Agency's Federal Guidance Report No. 11, Limiting Values of Radionuclide Intake

and Air Concentration and Dose Conversion Factors for Inhalation, Submersion, and Ingestion,

published September 1988. (10 CFR 835)

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