Wisconsin Legislature: DHS 157.03(116)

Note: For purposes of this chapter, the condition of light work is an inhalation rate of 1.2 cubic meters of air per hour for 2,000 hours in a year. DAC values are given in Table I, column 3, of ch. DHS 157 Appendix E.

(100) “Derived air concentration-hour” or “DAC-hour” means the product of the concentration of radioactive material in air, expressed as a fraction or multiple of the derived air concentration for each radionuclide, and the time of exposure to that radionuclide, in hours. A licensee or registrant may take 2,000 DAC-hours to represent one ALI, equivalent to a committed effective dose equivalent of 0.05 Sv (5 rem).

(101) “Detector” means a device which in the presence of radiation provides, by either direct or indirect means, a signal or other indication suitable for use in measuring one or more quantities of incident radiation.

(101m) “Deuterium” means deuterium and any deuterium compounds, including heavy water, in which the ratio of deuterium atoms to hydrogen atoms exceeds 1:5000.

(102) “Diagnostic source assembly” means the tube housing assembly with a beam-limiting device attached.

(103) “Diagnostic x-ray imaging system” means an assemblage of components for the generation, emission and reception of x-rays and the transformation, storage and visual display of the resultant x-ray image.

(103m) “DICOM” means digital imaging and communications in medicine.

(103r) “Discrete source” means a radionuclide that has been processed so that its concentration within a material has been purposely increased for use for commercial, medical, or research activities.

(104) “Disposable respirator” means a respirator for which maintenance is not intended and that is designed to be discarded after excessive breathing resistance, sorbent exhaustion, physical damage, or end-of-service-life renders it unsuitable for use. Examples of this type of respirator are a disposable half-mask respirator or a disposable escape-only self-contained breathing apparatus.

Note: Sorbent exhaustion refers to the inability of an absorbent material to absorb any more of the material for which it was designed.

(105) “Disposal” means the isolation of radioactive wastes from the environment inhabited by man and containing his food-chains by emplacement in a land disposal facility.

(106) “Disposal site” means that portion of a land disposal facility which is used for the disposal of waste. It consists of disposal units and a buffer zone.

(107) “Disposal unit” means a discrete portion of a disposal site into which waste is placed for disposal.

(108) “Distinguishable from background” means that the detectable concentration of a radionuclide is statistically different from the background concentration of that radionuclide in the vicinity of that site or, in the case of structures, in similar materials using adequate measurement technology, survey and statistical techniques.

(108m) “Diversion” means the unauthorized movement of category 1 or category 2 quantity of radioactive material that is subject to subch. XV to a location different from the material’s authorized destination inside or outside of the site at which the material is used or stored.

(109) “Dose equivalent” or “HT” means the product of the absorbed dose in tissue, quality factor and all other necessary modifying factors at the location of interest. The units of dose equivalent are the sievert and rem.

(109m) “Dose length product” or “DLP” means the metric which is related to the total energy imparted in the patient, and is determined by multiplying the CTDIvol value by the scan length, resulting in the units of mGy-cm. DLP is calculated using the following formula:

where:

L = the length of patient scanned.

p = is the pitch.

CTDI100,cent = CTDI100 value determined at the center of a standardized phantom.

CTDI100,periphery = CTDI100 value determined at the periphery of a standardized phantom.

(110) “Dose limits” means the permissible upper bounds of radiation doses established under this chapter.

(111) “Dose monitor unit” means a unit response from the beam monitoring system from which the absorbed dose may be calculated.

(112) “Dose profile” means the dose as a function of position along a line.

(113) “Dosimeter” means a recording device used to measure exposure to ionizing radiation.

(114) “Dosimetry processor” means an individual or an organization that processes and evaluates individual monitoring devices to determine the radiation dose delivered to the monitoring devices.

(115) “Doubly encapsulated sealed source” means a sealed source in which the radioactive material is sealed within an inner capsule and that capsule is sealed within an outer capsule.

(116) “Effective dose equivalent” or “EDE” means the sum of the products of the dose equivalent to each organ or tissue and the weighting factor applicable to each of the body organs or tissues that are irradiated (HE = å wTHT).

Note: Effective dose equivalent (HE) equals the sum of the weighting factor (wT) times the dose equivalent to each organ or tissue (HT).

(117) “Electron microscope” means a microscope utilizing electrons to provide high magnification examination of materials.

(118) “Elemental area” means the smallest area within a tomogram for which the x-ray attenuation properties of a body are depicted.

(119) “Embryo or fetus” means the developing human organism from conception until the time of birth.

(120) “Emergency” means an event requiring prompt action to mitigate a threat to the health and safety of workers and the public or a threat of damage to the environment.

(121) “Energy compensation source” or “ECS” means a small sealed source, with an activity not exceeding 3.7 MBq (100 microcuries), used within a well logging tool, or other tool components, to provide a reference standard to maintain the well logging tool’s calibration when in use.

(122) “Enriched uranium” means uranium containing more uranium-235 than the naturally occurring distribution of uranium isotopes.

(123) “Entrance air kerma rate” means the air kerma free in air per unit time at the point where the center of the useful beam enters the patient.

(124) “Entrance or access point” means any location through which an individual could gain access to radiation areas or to licensed or registered radioactive materials. This includes entry or exit portals of sufficient size to permit human entry, irrespective of their intended use.

(124g) “Escorted access” means the continuous direct visual surveillance by an approved individual over an individual in the security zone who is not approved for unescorted access.

(124m) “Exclusive use” means the sole use by a single consignor of a conveyance for which all initial, intermediate, and final loading and unloading are carried out in accordance with the direction of the consignor or consignee. The consignor and the carrier must ensure that any loading or unloading is performed by personnel having radiological training and resources appropriate for the safe handling of the consignment. The consignor shall issue specific instructions, in writing, for maintenance of exclusive use shipment controls, and include them with the shipping paper information provided to the carrier by the consignor.

(125) “Explosive material” means any chemical compound, mixture or device that produces a substantial instantaneous release of gas and heat spontaneously or by contact with sparks or flame.

(126) “Exposure” means the quotient of dQ divided by dm where “dQ” is the absolute value of the total charge of the ions of one sign produced in air when all the electrons liberated by photons in a volume element of air having mass “dm” are completely stopped in air. The SI unit of exposure is the coulomb per kilogram. The standard unit of exposure is the roentgen.

(127) “Exposure head” means a device that locates the gamma radiography sealed source in the selected working position.

(128) “Exposure rate” means the exposure per unit of time, such as roentgen per minute and milliroentgen per hour.

(129) “External beam radiation therapy” means therapeutic irradiation in which the source of radiation is at a distance from the body.

(130) “External dose” means that portion of the dose equivalent received from any source of radiation outside the body.

(131) “External sinking fund” means an account, segregated from licensee assets and outside the licensee’s administrative control, into which monies are periodically deposited that are sufficient to pay decommissioning costs expected at the time licensee operations are terminated.

(132) “Extremity” means hand, elbow, arm below the elbow, foot, knee and leg below the knee.

(133) “Extremity bone densitometer” means a device that tests the mineral content of the bone of the fore arm, hand or foot.

(134) “FDA” means the U.S. food and drug administration.

(135) “Field emission equipment” means equipment that uses an x-ray tube in which electron emission from the cathode is due solely to the action of an electric field.

(136) “Field station” means a facility where radioactive sources may be stored or used and from which equipment is dispatched to temporary job sites.

(137) “Film badge” means a dosimeter containing radiation sensitive photographic film for measuring radiation dose plus various filters that characterize the type of radiation encountered. When developed, the darkness of the film is directly proportional to the amount of radiation received.

(138) “Filter” means material placed in the useful beam to preferentially absorb selected radiation energies.

(139) “Filtering facepiece” means a negative pressure respirator with a filter as an integral part of the facepiece or with the entire facepiece composed of the filtering medium, not equipped with elastomeric sealing surfaces and adjustable straps.

Note: Elastomeric refers to material that is elastic and form fitting to provide a tight seal against the face.

(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.

(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.

Note: Certain exclusions from fissile material controls are provided in 10 CFR 71.15.

(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.

(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.

(143) “Fit test” means the use of a protocol to qualitatively or quantitatively evaluate the fit of a respirator on an individual.

(143g) “Fixed contamination” means contamination that cannot be removed from a surface during normal conditions of transport.

(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.

(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.

(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.

(146) “Gantry” means that part of a radiation therapy system supporting and allowing movements of the radiation head about a center of rotation.

(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.

(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.

(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.

(150) “Gonad shield” means a protective barrier for the testes or ovaries.

(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.

(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.

(151) “Gray” or “Gy” means the SI unit of absorbed dose, air kerma and specific energy imparted equal to one joule per kilogram.

Note: The special unit of absorbed dose is being replaced by the gray. 1 Gy equals 100 rad.

(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.

(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.

(154) “Hands-on experience” means experience in all of those areas considered to be directly involved in the radiography process.

Note: “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.

(155) “Healing arts” means a profession concerned with diagnosis and treatment of human maladies, including the practice of medicine, dentistry, osteopathy chiropractic and podiatry.

(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.

(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.

(158) “Helmet” means a rigid respiratory inlet covering that also provides head protection against impact and penetration.

(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.

(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.

(161) “Hood” means a respiratory inlet covering that completely covers the head and neck and may also cover portions of the shoulders and torso.

(162) “Human use” means the internal or external administration of radiation or radioactive material to human beings.

(163) “Image intensifier” means a device, installed in its housing, which instantaneously converts an x-ray pattern into a corresponding light image of higher intensity.