DHS 157.03(306)(306) “Radiographic imaging system” means any system whereby a permanent or semi-permanent image is recorded on an image receptor by the action of ionizing radiation. DHS 157.03(307)(307) “Radiographic operations” means all activities performed with a radiographic exposure device or with a radiation machine. Activities include using, transporting, except by common or contract carriers or storing at a temporary job site, performing surveys to confirm the adequacy of boundaries, setting up equipment and any activity inside restricted area boundaries. Transporting a radiation machine is not considered a radiographic operation. DHS 157.03(308)(308) “Radionuclide” means a radioactive form of an element. DHS 157.03(309)(309) “Rating” means the operating limits as specified by the component manufacturer. DHS 157.03(310)(310) “Redundant beam monitoring system” means a combination of 2 dose monitoring systems in which each system is designed to terminate irradiation under a pre-selected number of dose monitor units. DHS 157.03(311)(311) “Reference man” means a hypothetical aggregation of human physical and physiological characteristics determined by international consensus. These characteristics may be used by researchers and public health workers to standardize results of experiments and to relate biological insult to a common base. DHS 157.03(312)(312) “Reference plane” means a plane that is displaced from and parallel to the tomographic plane. DHS 157.03(314)(314) “Rem” means the special unit of any of the quantities expressed as dose equivalent. DHS 157.03 NoteNote: The dose equivalent in rem is equal to the absorbed dose in rad multiplied by the quality factor. One rem equals 0.01 sievert.
DHS 157.03(315)(315) “Research and development” means either of the following: DHS 157.03(315)(b)(b) The practical application of investigative findings and theories of a scientific or technical nature for experimental and demonstration purposes, including the experimental production and testing of models, devices, equipment, materials and processes. Research and development does not include the internal or external administration of radiation or radioactive material to human beings. DHS 157.03(316)(316) “Residual radioactivity” means radioactivity in structures, materials, soils, groundwater and other media at a site resulting from activities under the licensee’s or registrant’s control. “Residual radioactivity” includes radioactivity from all sources used by the licensee or registrant, but excludes background radiation. “Residual radioactivity” also includes radioactive materials remaining at the site as a result of routine or accidental releases of radioactive material at the site and previous burials at the site, even if those burials were made in accordance with the provisions of this chapter. DHS 157.03(317)(317) “Respiratory protective equipment” means an apparatus, such as a respirator, used to reduce an individual’s intake of airborne radioactive materials. DHS 157.03(318)(318) “Restricted area” means an area, access to which is limited by the licensee or registrant for the purpose of protecting individuals against undue risks from exposure to sources of radiation. “Restricted area” does not include areas used as residential quarters, but separate rooms in a residential building may be set apart as a restricted area. DHS 157.03(318m)(318m) “Reviewing official” means the individual who shall make the trustworthiness and reliability determination of an individual to determine whether the individual may have, or continue to have, unescorted access to the category 1 or category 2 quantities of radioactive materials that are possessed by the licensee. DHS 157.03(319)(319) “Roentgen” or “R” means the special unit of exposure. One roentgen equals 2.58E-4 coulombs per kilogram of air. DHS 157.03 NoteNote: See the definition of the term “exposure” and also s. DHS 157.06 (4) for a further explanation of units of exposure. DHS 157.03(319g)(319g) “Sabotage” means the act of any person who intentionally damages, interferes, or tampers with reasonable grounds to believe his or her act will hinder, delay, or interfere with the normal operation of any one of the following: DHS 157.03(319g)(b)(b) A device that contains a category 1 or category 2 quantity of radioactive material. DHS 157.03(319r)(319r) “Safe haven” means a readily recognizable and readily accessible site at which security is present or from which, in the event of an emergency, the transport crew can notify and wait for the local law enforcement authorities. DHS 157.03(320)(320) “Sanitary sewerage” means a system of public sewers for carrying off wastewater and refuse, but excluding sewage treatment facilities, septic tanks and leach fields owned or operated by the licensee or registrant. DHS 157.03(321)(321) “Scan” means the complete process of collecting x-ray transmission data for the production of a tomogram. Data may be collected simultaneously during a single scan for the production of one or more tomograms. DHS 157.03(322)(322) “Scan increment” means the amount of relative displacement of the patient with respect to the CT x-ray system between successive scans measured along the direction of such displacement. DHS 157.03(323)(323) “Scan sequence” means a pre-selected set of 2 or more scans performed consecutively under pre-selected CT conditions of operation. DHS 157.03(324)(324) “Scan time” means the period of time between the beginning and end of x-ray transmission data accumulation for a single scan.