DHS 157.03(179) (179) “Irradiator operator” means an individual who has successfully completed the training and testing described in s. DHS 157.73 (12) and is authorized by the terms of the license to operate the irradiator without a supervisor present.

DHS 157.03(180) (180) “Irradiator operator supervisor” means an individual who meets the requirements for an irradiator operator and who physically oversees operation of the irradiator by an individual who is currently receiving training and testing described in s. DHS 157.73 (12).

DHS 157.03(181) (181) “Isocenter” means the center of the sphere through which the useful beam axis passes while the gantry moves through its full range of motions.

DHS 157.03(182) (182) “Kilovolt” or “kV” means the energy equal to that acquired by a photon with one electron charge in passing through a potential difference of 1,000 volts in a vacuum.

DHS 157.03 Note Note: Current convention uses kV to designate photons and keV to designate electrons.

DHS 157.03(183) (183) “Kilovolts peak” or “kVp” means the maximum value of the potential difference across an x-ray tube during an exposure.

DHS 157.03(184) (184) “kWs” means kilowatt second.

DHS 157.03(185) (185) “Land disposal facility” means the land, buildings and structures, and equipment used for the disposal of radioactive wastes.

DHS 157.03(185m) (185m) “Last-image hold” or “LIH” means an image obtained either by retaining one or more fluoroscopic images, which may be temporally integrated, at the end of a fluoroscopic exposure or by initiating a separate and distinct radiographic exposure automatically and immediately in conjunction with termination of the fluoroscopic exposure.

DHS 157.03(185r) (185r) “Lateral fluoroscope” means the x-ray tube and image receptor combination in a biplane system dedicated to the lateral projection. It consists of the lateral x-ray tube housing assembly and the lateral image receptor that are fixed in position relative to the table with the x-ray beam axis parallel to the plane of the table.

DHS 157.03(186) (186) “Lay-barge radiography” means industrial radiography performed on any water vessel used for laying pipe.

DHS 157.03(187) (187) “Lead equivalent” means the thickness of the material in question affording the same attenuation as lead.

DHS 157.03(188) (188) “Leakage radiation” means radiation emanating from the diagnostic source assembly except for any of the following:

DHS 157.03(188)(a) (a) The useful beam.

DHS 157.03(188)(b) (b) Radiation produced when the exposure switch or timer is not activated.

DHS 157.03(189) (189) “Lens dose equivalent” or “LDE” means the external dose equivalent to the lens of the eye at a tissue depth of 0.3 centimeter (300 mg/cm2).

DHS 157.03(189m) (189m) “License verification system” means the national verification system that enables authorized government authorities and authorized licensees to verify certain information about licensees authorized to possess, use, or ship radioactive materials.

DHS 157.03 Note Note: The system may be used to confirm that a license is valid and accurate, a licensee is authorized to acquire quantities and types of radioactive materials, and the licensee’s category 1 or 2 quantities of radioactive material inventories do not exceed the possession limits of the license.

DHS 157.03(190) (190) “Licensed or registered material” means radioactive material received, possessed, used, transferred or disposed of under a general or specific license or registration issued by the department.

DHS 157.03(191) (191) “Licensed practitioner” means a chiropractor, dentist, physician, podiatrist, physician assistant, nurse practitioner or radiologist’s assistant licensed in the state of Wisconsin.

DHS 157.03(192) (192) “Licensing state” means any state approved by the Conference of Radiation Control Program Directors, Inc., as having regulations equivalent to the Suggested State Regulations for Control of Radiation relating to NARM and an effective program for the regulatory control of NARM.

DHS 157.03(193) (193) “Light field” means the area of the intersection of the light beam from the beam-limiting device and one of the set of planes parallel to and including the plane of the image receptor, whose perimeter is the locus of points at which the illumination is one-fourth of the maximum in the intersection.

DHS 157.03(193e) (193e) “Local components” means parts of a radiation generating device x-ray system and include areas that are struck by x-rays such as radiation source housings, beam port and shutter assemblies, collimators, sample holders, cameras, goniometers, detectors, and shielding, but do not include power supplies, transformers, amplifiers, readout devices, and control panels.

DHS 157.03(193m) (193m) “Local law enforcement agency” or “LLEA” means a public or private organization that has been approved by a federal, state, or local government to carry firearms and make arrests, and is authorized and has the capability to provide an armed response in the jurisdiction where the licensed category 1 or category 2 quantity of radioactive material is used, stored, or transported.

DHS 157.03(194) (194) “Logging tool” means a device used subsurface to perform well logging.

DHS 157.03(195) (195) “Loose-fitting facepiece” means a respiratory inlet covering that is designed to form a partial seal with the face.

DHS 157.03(196) (196) “Lost or missing licensed or registered source of radiation” means a licensed or registered source of radiation whose location is unknown. This definition includes licensed or registered material that has been shipped but has not reached its planned destination and whose location cannot be readily traced in the transportation system.

DHS 157.03(197) (197) “Low dose-rate remote afterloader” or “LDR” means a device that delivers a dose rate of less than or equal to 2 gray (200 rads) per hour.

DHS 157.03(197m) (197m) ”Low specific activity” means radioactive material with limited specific activity which is nonfissile or is excepted under s. DHS 157.92 (2) (c), and which satisfies the descriptions and limits set forth in ss. DHS 157.03 (198), (199) or (200). Shielding materials surrounding the low specific activity material may not be considered in determining the estimated average specific activity of the package contents.