DHS 157.03(169) (169) “Individual monitoring devices,” mean devices designed to be worn by a single individual for the assessment of dose equivalent. Examples of individual monitoring devices are film badges, thermoluminescent dosimeters, optically stimulated luminescent dosimeters, pocket dosimeters, direct reading dosimeters and personal air sampling devices.

DHS 157.03(170) (170) “Industrial radiography” means an examination of the structure of materials by the nondestructive method of utilizing ionizing radiation to make radiographic images.

DHS 157.03(171) (171) “Inherent filtration” means the filtration of the useful beam provided by the permanently installed components of the tube housing assembly.

DHS 157.03(172) (172) “Injection tool” means a device used for controlled subsurface injection of radioactive tracer material.

DHS 157.03(173) (173) “Inspection” means an official examination or observation by the department including tests, surveys and monitoring to determine compliance with rules, regulations, orders, requirements and conditions of the department.

DHS 157.03(174) (174) “Interlock” means a device preventing the start or continued operation of equipment unless certain predetermined conditions prevail.

DHS 157.03(175) (175) “Internal dose” means that portion of the dose equivalent received from radioactive material taken into the body.

DHS 157.03(176) (176) “Ionizing radiation” means alpha particles, beta particles, gamma rays, x rays, neutrons, high-speed electrons, high-speed protons and other particles capable of producing ions. “Ionizing radiation” does not include radiowaves or microwaves, visible, infrared or ultraviolet light.

DHS 157.03(177) (177) “Irradiation” means the exposure of a living being or matter to ionizing radiation.

DHS 157.03(178) (178) “Irradiator” means a facility that uses radioactive sealed sources for the irradiation of objects or materials and in which radiation dose rates exceeding 5 grays (500 rads) per hour exist at one meter from the sealed radioactive sources in air or water, as applicable for the irradiator type, but does not include irradiators in which both the sealed source and the area subject to irradiation are contained within a device and are not accessible to personnel.

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.