high-efficiency particulate air (HEPA) filter: Throwaway extended pleated medium dry-type filter with 1) a rigid
casing enclosing the full depth of the pleats, 2) a minimum particle removal efficiency of 99.97 percent for thermally
generated monodisperse di-octyl phthalate smoke particles with a diameter of 0.3 micrometer, and 3) a maximum
pressure drop of 1.0 inch w.g. when clean and operated at its rated airflow capacity.
high contamination area: Any area, accessible to individuals, where removable surface contamination levels exceed or
are likely to exceed 100 times the removable surface contamination values specified in Chapter 2, Table 2-2 [see
high radiation area: Any area, accessible to individuals, in which radiation levels could result in an individual
receiving a deep dose equivalent in excess of 0.1 rem (0.001 Sv) in 1 hour at 30 centimeters from the radiation source or
from any surface that the radiation penetrates [see 835.2(a)].
hot particle: Fuel, activated corrosion product, or other particles of small size that have a high specific activity as a
result of nuclear fission or neutron activation. When in direct contact with the skin, hot particles are capable of
producing a shallow dose equivalent of 100 millirem or more in one hour to a localized area.
hot spot: Localized source of radiation or radioactive material normally within facility piping or equipment. The
radiation levels of hot spots exceed the general area radiation level by more than a factor of 5 and are greater than 100
millirem (1 mSv) per hour on contact.
individual: Any human being [see 835.2(a)].
infrequent or first-time activities: Radiological work activities or operations that require special management attention
and consideration of new or novel radiological controls. The designation of infrequent or first-time activities is
specifically applicable to facilities that conduct routine and recurring process operations, and is not applicable to facilities
that routinely conduct first-time activities, such as experimental or research facilities.
irradiator: Sealed radioactive material used to irradiate other materials that has the potential to create a radiation level
exceeding 500 rad (5 grays) in 1 hour at 1 meter. Although not addressed in this Standard, acceptable radiological
controls for irradiator use are specified in Title 10, Code of Federal Regulations, Part 20.1603.
lifetime dose: Total occupational dose over a worker's lifetime, including external and internal dose.
low-level waste: Waste that contains radioactive material and is not classified as high-level waste, transuranic waste,
spent nuclear fuel, or byproduct material as defined in Section 11e(2) of the Atomic Energy Act, as amended. Test
specimens of fissionable material irradiated only for research and development and not for production of power or
plutonium may be classified as low-level waste provided the concentration of transuranic activity is less than 100 nCi/g.
member of the public: An individual who is not a general employee. An individual is not a "member of the public"
during any period in which the individual receives an occupational dose [see 835.2(a)].
minor: An individual less than 18 years of age [see 835.2(a)].
mixed waste: Waste containing both radioactive and hazardous components as defined by the Atomic Energy Act and
the Resource Conservation and Recovery Act, respectively.