# Wis. Admin. Code DHS § 157.03: Definitions > Wisconsin · Regulations · In force URL: https://www.frixlaw.com/law-library/statutes/STATE_WI_ADC_DHS_157_03 ## Section - **Citation:** Wis. Admin. Code DHS § 157.03 - **Heading:** Definitions - **Jurisdiction:** Wisconsin - **Kind:** Regulations - **Status:** In force - **Text as of:** August 14, 2026 - **Source:** Compiled text - **Location:** Wisconsin Administrative Code / DHS / Chapter DHS 157 / § DHS 157.03 ## Text Definitions. Definitions. In this chapter: (1) “A 1 ” means the maximum activity of special form radioactive material permitted in a Type A package. This value is either listed in Table VI and Table VIII in ch. DHS 157 Appendix O or may be derived under the procedures prescribed in ch. DHS 157 Appendix O . (2) “A 2 ” means the maximum activity of radioactive material, other than special form material, LSA and SCO material, permitted in a Type A package. This value is either listed in Table VI and Table VIII in ch. DHS 157 Appendix O or may be derived under the procedures prescribed in ch. DHS 157 Appendix O . (3) “Absorbed dose or “D” means the energy imparted by ionizing radiation per unit of mass of irradiated material. The units of absorbed dose are the rad and the gray (Gy). (4) “Absorbed dose rate” means absorbed dose per unit time, for machines with timers, or dose monitor unit per unit time for accelerators. (5) “Accelerator” or “particle accelerator” means any machine capable of accelerating electrons, protons, deuterons or other charged particles in a vacuum and of discharging the resultant particle or other radiation into a medium at energies usually in excess of one MeV. (6) “Accelerator-produced radioactive material” means any material made radioactive by an accelerator. (6m) “Access control” means a system for allowing only approved individuals to have unescorted access to the security zone and for ensuring that all other individuals are subject to escorted access. (7) “Accessible surface” means surface of equipment or of an equipment part, housing or enclosure of the radiation producing machine that may be easily or accidentally touched by persons without the use of a tool. (8) “Act” means ss. 254.31 to 254.45 , Stats. (9) “Activity” means the rate of disintegration or transformation or decay of radioactive material. The units of activity are the becquerel and the curie. (10) “Added filtration” means any filtration which is in addition to the inherent filtration. iation producing machine that may be easily or accidentally touched by persons without the use of a tool. (8) “Act” means ss. 254.31 to 254.45 , Stats. (9) “Activity” means the rate of disintegration or transformation or decay of radioactive material. The units of activity are the becquerel and the curie. (10) “Added filtration” means any filtration which is in addition to the inherent filtration. (11) “Address of use” means the building or buildings that are identified on the license and where radioactive material may be received, used or stored. (12) “Adult” means an individual 18 or more years of age. (12m) ”Aggregated” means accessible by the breach of a single physical barrier that would allow access to radioactive material in any form, including any devices that contain the radioactive material. (13) “Agreement state” means any state with which the U.S. nuclear regulatory commission or the U.S. atomic energy commission has entered into an effective agreement under subsection 274b of the atomic energy act of 1954, as amended. (14) “Air-purifying respirator” means a respirator with an air-purifying filter, cartridge, or canister that removes specific air contaminants by passing ambient air through the air-purifying element. (15) “Airborne radioactive material” means any radioactive material dispersed in the air in the form of dusts, fumes, particulates, mists, vapors or gases. (16) “Airborne radioactivity area” means a room, enclosure or area in which airborne radioactive materials, composed wholly or partly of licensed material, exist in concentrations that meet either of the following criteria: (a) In excess of the derived air concentrations specified in ch. DHS 157 Appendix E , table I. sed in the air in the form of dusts, fumes, particulates, mists, vapors or gases. (16) “Airborne radioactivity area” means a room, enclosure or area in which airborne radioactive materials, composed wholly or partly of licensed material, exist in concentrations that meet either of the following criteria: (a) In excess of the derived air concentrations specified in ch. DHS 157 Appendix E , table I. (b) An individual present in the area without respiratory protective equipment could exceed, during the hours an individual is present in a week, an intake of 0.6% of the annual limit on intake or 12 DAC-hours. (17) “Air kerma” or “K” means the sum of the initial kinetic energies of all the charged ionizing particles liberated by uncharged ionizing particles per unit mass of air. Kerma is determined as the quotient of dE divided by dM, where dE is the sum of the initial kinetic energies of all the charged ionizing particles liberated by uncharged ionizing particles in air of mass dM. The SI unit of air kerma is joule per kilogram and the special name for the unit of kerma is the gray. (17m) “Air kerma rate” means the air kerma per unit time. (18) “Alarming ratemeter” means a radiation measurement device that may be set to alarm at a pre-set dose rate. (19) “Alert” means an event may occur, is in progress, or has occurred that could lead to a release of radioactive material but that the release is not expected to require a response by offsite response organizations to protect people offsite. (20) “Alignment helmet” means a guide placed on the head that directs radiation to a specific site during stereotactic surgery. (21) “Aluminum equivalent” means the thickness of type 1100 aluminum alloy affording the same attenuation, under specified conditions, as the material in question. (22) “Analytical x-ray system” means x-ray equipment that generates ionizing radiation by electronic means for the purpose of examining the microstructure and composition of materials. ion to a specific site during stereotactic surgery. (21) “Aluminum equivalent” means the thickness of type 1100 aluminum alloy affording the same attenuation, under specified conditions, as the material in question. (22) “Analytical x-ray system” means x-ray equipment that generates ionizing radiation by electronic means for the purpose of examining the microstructure and composition of materials. (23) “Annual refresher safety training” means a review conducted or provided by the licensee or registrant for its employees on radiation safety aspects of industrial radiography. (24) “Annual limit on intake” or “ALI” means the derived limit for the amount of radioactive material taken into the body of an adult worker by inhalation or ingestion in a year. Annual limit on intake is the smaller value of intake of a given radionuclide in a year by the reference person that would result in a committed effective dose equivalent of 0.05 Sv (5 rem) or a committed dose equivalent of 0.5 Sv (50 rem) to any individual organ or tissue. (25) “ANSI” means the American National Standards Institute. (25m) “Approved individual” means an individual whom the licensee has determined to be trustworthy and reliable for unescorted access under ss. DHS 157.9700 to 157.9706 and who has completed the training required by s. DHS 157.9708 (3) . (26) “Area of use” means a portion of an address of use that has been set aside for the purpose of receiving, using or storing radioactive material. ds Institute. (25m) “Approved individual” means an individual whom the licensee has determined to be trustworthy and reliable for unescorted access under ss. DHS 157.9700 to 157.9706 and who has completed the training required by s. DHS 157.9708 (3) . (26) “Area of use” means a portion of an address of use that has been set aside for the purpose of receiving, using or storing radioactive material. (27) “As low as is reasonably achievable” or “ALARA” means making every reasonable effort to maintain exposures to radiation as far below the dose limits in this chapter as is practical, consistent with the purpose for which the licensed or registered activity is undertaken, taking into account the state of technology, the economics of improvements in relation to state of technology, the economics of improvements in relation to benefits to the public health and safety and other societal and socioeconomic considerations, and in relation to utilization of nuclear energy and licensed or registered sources of radiation in the public interest. (28) “Assembler” means any person engaged in the business of assembling, replacing or installing one or more components into an x-ray system or subsystem. The term includes the owner of an x-ray system or his or her employee or agent who assembles components into an x-ray system that is subsequently used to provide professional or commercial services. (29) “Assigned Protection Factor” or “APF” means the expected workplace level of respiratory protection that would be provided by a properly functioning respirator or a class of respirators to properly trained and fitted users. Operationally, the inhaled concentration may be estimated by dividing the ambient airborne concentration by the APF. ly used to provide professional or commercial services. (29) “Assigned Protection Factor” or “APF” means the expected workplace level of respiratory protection that would be provided by a properly functioning respirator or a class of respirators to properly trained and fitted users. Operationally, the inhaled concentration may be estimated by dividing the ambient airborne concentration by the APF. (30) “Associated equipment” means equipment that is used in conjunction with a radiographic exposure device to make radiographic exposures that drives, guides or comes in contact with the source. (30m) “Associate radiation safety officer” means an individual who meets all of the following qualifications: (a) Satisfies the requirements in s. DHS 157.61 (7) and (11) . (b) Is currently identified as an associate radiation safety officer for the types of use of radioactive material for which the individual has been assigned duties and tasks by the radiation safety officer on a specific medical use license issued by the department, the NRC, or another agreement state or medical use permit issued by an NRC master material licensee. (31) “Atmosphere-supplying respirator” means a respirator that supplies the respirator user with breathing air from a source independent of the ambient atmosphere, and includes supplied-air respirators and self-contained breathing apparatus units. (32) “Attenuation block” means a block or stack of type 1100 aluminum alloy, or aluminum alloy having equivalent attenuation, with dimensions 20 centimeters by 20 centimeters or larger by 3.8 centimeters that is large enough to intercept the entire x-ray beam. (32m) ”Authorized medical physicist” means an individual who has any of the following qualifications: (a) Meets the training requirements in s. DHS 157.61 (8) (a) and (11) . (b) Is identified as an authorized medical physicist on a specific medical use license or equivalent permit issued by the department, NRC or another agreement state. ers that is large enough to intercept the entire x-ray beam. (32m) ”Authorized medical physicist” means an individual who has any of the following qualifications: (a) Meets the training requirements in s. DHS 157.61 (8) (a) and (11) . (b) Is identified as an authorized medical physicist on a specific medical use license or equivalent permit issued by the department, NRC or another agreement state. (c) Is identified as an authorized medical physicist on a permit issued by the department, NRC or another agreement state specific medical use licensee of broad scope that is authorized to permit the use of radioactive material. (33) “Authorized nuclear pharmacist” means a pharmacist licensed by the state under ch. 450 , Stats., and who fulfills at least one of the following: (a) Meets the requirements in s. DHS 157.61 (9) (a) and (11) . (b) Is identified as an authorized nuclear pharmacist on a nuclear regulatory commission or agreement state license or other equivalent permit or license recognized by the NRC that authorizes the medical use of radioactive material or the practice of nuclear pharmacy. (c) Is identified as an authorized nuclear pharmacist on a permit issued by an NRC or agreement state specific licensee of broad scope that is authorized to permit the medical use of radioactive material or the practice of nuclear pharmacy. (d) Is approved as an authorized nuclear pharmacist by a nuclear pharmacy authorized by the NRC or an agreement state to approve authorized nuclear pharmacists. (34) “Authorized user” means a state licensed person engaged in the healing arts who fulfills at least one of the following: (a) Meets the recentness of training requirements in s. DHS 157.61 (11) and the certification requirement, depending upon the desired use of the radioactive material, found in any of the following: 1. Section DHS 157.63 (4) (a) . 2. Section DHS 157.63 (5) (a) . 3. Section DHS 157.64 (4) (a) . ## Nearby sections - [Wis. Admin. Code DHS § 157.01 Authority and purpose](https://www.frixlaw.com/law-library/statutes/STATE_WI_ADC_DHS_157_01.md) - [Wis. Admin. Code DHS § 157.02 Applicability](https://www.frixlaw.com/law-library/statutes/STATE_WI_ADC_DHS_157_02.md) - [Wis. Admin. Code DHS § 157.03 Definitions](https://www.frixlaw.com/law-library/statutes/STATE_WI_ADC_DHS_157_03.md) - [Wis. Admin. Code DHS § 157.04 Exemptions from the regulatory requirements](https://www.frixlaw.com/law-library/statutes/STATE_WI_ADC_DHS_157_04.md) - [Wis. Admin. Code DHS § 157.05 Prohibitions](https://www.frixlaw.com/law-library/statutes/STATE_WI_ADC_DHS_157_05.md) - [Wis. Admin. Code DHS § 157.06 General regulatory requirements](https://www.frixlaw.com/law-library/statutes/STATE_WI_ADC_DHS_157_06.md) - [Wis. Admin. Code DHS § 157.09 Exemptions](https://www.frixlaw.com/law-library/statutes/STATE_WI_ADC_DHS_157_09.md) - [Wis. Admin. Code DHS § 157.10 License types and fees](https://www.frixlaw.com/law-library/statutes/STATE_WI_ADC_DHS_157_10.md) - [Wis. Admin. Code DHS § 157.11 General licenses](https://www.frixlaw.com/law-library/statutes/STATE_WI_ADC_DHS_157_11.md) - [Wis. Admin. Code DHS § 157.12 Registration of generally licensed devices](https://www.frixlaw.com/law-library/statutes/STATE_WI_ADC_DHS_157_12.md) - [Wis. Admin. Code DHS § 157.13 Specific licenses](https://www.frixlaw.com/law-library/statutes/STATE_WI_ADC_DHS_157_13.md) - [Wis. Admin. Code DHS § 157.14 Reciprocity](https://www.frixlaw.com/law-library/statutes/STATE_WI_ADC_DHS_157_14.md) - [Wis. Admin. Code DHS § 157.15 Financial assurance and records for decommissioning](https://www.frixlaw.com/law-library/statutes/STATE_WI_ADC_DHS_157_15.md) - [Wis. Admin. Code DHS § 157.20 Implementation](https://www.frixlaw.com/law-library/statutes/STATE_WI_ADC_DHS_157_20.md) --- Source: Frix Law Library, https://www.frixlaw.com/law-library/statutes/STATE_WI_ADC_DHS_157_03. Check the current official text before relying on it. Not legal advice.