DHS 157.03(139m)(139m)“Fingerprint order” means an order issued by the NRC, a license condition by the department, or a legally binding requirement issued by another agreement state that requires a fingerprints and criminal history records check for individuals who have unescorted access to category 1 and category 2 quantities of radioactive material or safeguards information-modified handling.
DHS 157.03(140)(140)“Fissile material” means the radionuclides uranium-233, uranium-235, plutonium-239 and plutonium-241, or any combination of these radionuclides. Fissile material means the fissile nuclides themselves, not material containing fissile nuclides. Unirradiated natural uranium and depleted uranium, and natural uranium or depleted uranium that has been irradiated in thermal reactors only are not included in this definition.
DHS 157.03 NoteNote: Certain exclusions from fissile material controls are provided in 10 CFR 71.15.
DHS 157.03(141)(141)“Fissile material package” or Type AF package, Type BF package, Type B(U)F package, or Type B(M)F package means a fissile material packaging together with its fissile material contents.
DHS 157.03(142)(142)“Fit factor” means a quantitative estimate of the fit of a particular respirator to a specific individual, and estimates the ratio of the concentration of a substance in ambient air to its concentration inside the respirator when worn.
DHS 157.03(143)(143)“Fit test” means the use of a protocol to qualitatively or quantitatively evaluate the fit of a respirator on an individual.
DHS 157.03(143g)(143g)“Fixed contamination” means contamination that cannot be removed from a surface during normal conditions of transport.
DHS 157.03(143m)(143m)“Fluoroscopic air kerma display device” means a device, or subsystem, or component that provided the display of the air kerma rate and cumulative air kerma required by 21 CFR 1020.32 (k). It includes radiation detectors, if any, electronic and computer components, associated software, and display units.
DHS 157.03(144)(144)“Fluoroscopic imaging assembly” means a subsystem in which x-ray photons produce a visible image. It includes the image receptor such as the image intensifier and spot-film device, electrical interlocks, if any, and structural material providing linkage between the image receptor and diagnostic source assembly.
DHS 157.03(145)(145)“Fresh water aquifer” means, for the purposes of this chapter, a geologic formation that is capable of yielding fresh water to a well or spring.
DHS 157.03(146)(146)“Gantry” means that part of a radiation therapy system supporting and allowing movements of the radiation head about a center of rotation.
DHS 157.03(147)(147)“General purpose radiographic x-ray system” means any radiographic x-ray system, which, by design, is not limited to radiographic examination of specific anatomical regions.
DHS 157.03(148)(148)“Gamma stereotactic radiosurgery” means the use of a device containing a radioactive material providing multiple point radiation therapy treatment to a specific tumor site.
DHS 157.03(149)(149)“Generally applicable environmental radiation standards” means standards issued by the U.S. environmental protection agency under the authority of 42 USC 23, that impose limits on radiation exposures or levels, or concentrations or quantities of radioactive material, in the general environment outside the boundaries of locations under the control of persons possessing or using radioactive material.
DHS 157.03(150)(150)“Gonad shield” means a protective barrier for the testes or ovaries.
DHS 157.03(150g)(150g)“Government agency” means any executive department, commission, independent establishment, corporation, wholly or partly owned by the United States of America which is an instrumentality of the United States, or any board, bureau, division, service, office, officer, authority, administration, or other establishment in the executive branch of the Government.
DHS 157.03(150m)(150m)“Graphite” means, for the purposes of 10 CFR 71.15 and 10 CFR 71.22, graphite with a boron equivalent content less than 5 parts per million and density greater than 1.5 grams per cubic centimeter.
DHS 157.03(151)(151)“Gray” or “Gy” means the SI unit of absorbed dose, air kerma and specific energy imparted equal to one joule per kilogram.
DHS 157.03 NoteNote: The special unit of absorbed dose is being replaced by the gray. 1 Gy equals 100 rad.
DHS 157.03(152)(152)“Guide tube” means a flexible or rigid tube, for guiding the source assembly and the attached control cable from the exposure device to the exposure head. The guide tube may also include the connections necessary for attachment to the exposure device and to the exposure head.
DHS 157.03(153)(153)“Half-value layer” or “HVL” means the thickness of specified material which attenuates an x-ray or gamma radiation beam such that the air kerma rate at a point within the radiation beam is reduced to one-half of the air kerma rate at the same point without the material present. In this definition, the contribution of all scattered radiation, other than any that might be present initially in the radiation beam concerned, is excluded.
DHS 157.03(154)(154)“Hands-on experience” means experience in all of those areas considered to be directly involved in the radiography process.
DHS 157.03 NoteNote: “Hands-on experience” includes taking radiographs, calibration of survey instruments, operational and performance testing of survey instruments and devices, film development, posting of warning signs in radiation areas, transportation of radiography equipment, posting on a bulletin board of records and radiation area surveillance, as applicable.
DHS 157.03(155)(155)“Healing arts” means a profession concerned with diagnosis and treatment of human maladies, including the practice of medicine, dentistry, osteopathy chiropractic and podiatry.
DHS 157.03(156)(156)“Healing arts screening” means the exposure of a human being to x-rays without prior examination disclosing a need for an x-ray procedure and prescription for such a study by a practitioner of the healing arts.
DHS 157.03(157)(157)“Heat unit” means a unit of energy equal to 0.75 joule. It is approximately equal to the energy given by the product of the peak kilovoltage, milliampere and seconds, which is kVp x mA x time in seconds.
DHS 157.03(158)(158)“Helmet” means a rigid respiratory inlet covering that also provides head protection against impact and penetration.
DHS 157.03(159)(159)“High dose-rate remote afterloader” or “HDR” means a device that delivers a dose rate in excess of 12 gray (1200 rads) per hour.
DHS 157.03(160)(160)“High radiation area” means an area, accessible to individuals, in which radiation levels from radiation sources external to the body could result in an individual receiving a dose equivalent in excess of one mSv (0.1 rem) in one hour at 30 centimeters from any source of radiation or 30 centimeters from any surface that the radiation penetrates.