| (77) Public dose--The dose received by a member of
the public from exposure to radiation from licensed/registered and
unlicensed/unregistered sources of radiation, whether in the possession
of the licensee/registrant or other person. It does not include occupational
dose or doses received from background radiation, from any medical
administration the individual has received, from exposure to individuals
administered radioactive material and released in accordance with
this section, or from voluntary participation in medical research
programs, or as a member of the public.
(78) Rad--The special unit of absorbed dose. One rad
is equal to an absorbed dose of 100 ergs per gram (erg/g) or 0.01
J/kg (0.01 Gy).
(79) Radiation (ionizing radiation)--Any alpha particles,
beta particles, gamma rays, x-rays, neutrons, high-speed electrons,
high-speed protons, and other particles capable of producing ions.
Radiation, as used in this part, does not include non-ionizing radiation,
such as radio- or microwaves, or visible, infrared, or ultraviolet
light.
(80) Radiation area--Any area, accessible to individuals,
in which radiation levels could result in an individual receiving
a dose equivalent in excess of 0.005 rem (0.05 mSv) in 1 hour at 30
cm from the radiation machine or from any surface that the radiation
penetrates.
(81) Radiation machine--An x-ray system, subsystem,
or component capable of producing ionizing radiation except those
devices with radioactive material as the only source of radiation.
For purposes of this section, "radiation machine," "x-ray equipment,"
"x-ray system," and "x-ray unit" are equivalent terms. Types of radiation
machines include:
(A) A stationary radiation machine, which is a radiation
machine that is installed in a fixed location.
(B) A hand-held radiation machine, which is a radiation
machine that is designed to be hand-held during operation.
(C) A portable radiation machine, which is a radiation
machine that is mounted on a permanent base with wheels or casters
for moving while completely assembled, including a hand-carried radiation
machine that is designed to be mounted on a support while operating.
(D) A mobile radiation machine, which is a radiation
machine that is transported in a vehicle to be used at various temporary
locations.
(82) Radiation safety officer (RSO)--An individual
who has a knowledge of and the authority and responsibility to apply
appropriate radiation protection rules, standards, and practices,
who shall be specifically authorized on a certificate of registration,
and who is the primary contact with the agency.
(83) Radiograph--An image receptor on which the image
is created directly or indirectly by an x-ray exposure and results
in a permanent record.
(84) Registrant--Any person issued a certificate of
registration by the agency in accordance with the Act and this chapter.
(85) Regulation--See definition for rule.
(86) Rem--The special unit of any of the quantities
expressed as dose equivalent. The dose equivalent in rem Sv is equal
to the absorbed dose in rad or Gy multiplied by the quality factor
(1 rem = 0.01 Sv).
(87) Remote inspection--An examination by the agency
of information submitted by the registrant on a form provided by the
agency.
(88) Research and development--Research and development
is defined as:
(A) theoretical analysis, exploration, or experimentation;
or
(B) the extension of investigative findings and theories
of a scientific or technical nature into practical application for
experimental and demonstration purposes, including the experimental
production and testing of models, devices, radiation machines, equipment,
materials, and processes.
(89) Restricted area--An area, access to which is limited
by the registrant for the purpose of protecting individuals against
undue risks from exposure to 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.
(90) Roentgen (R)--The special unit of exposure. One
R equals 2.58 x 10‑4 C/kg of air
(See definition for exposure).
(91) Rule--Any agency statement of general applicability
that implements, interprets, or prescribes law or policy, or describes
the procedure or practice requirements of an agency. The term includes
the amendment or repeal of a prior section but does not include statements
concerning only the internal management or organization of any agency
and not affecting private rights or procedures. The word "rule" was
formerly referred to as "regulation."
(92) Scan--The complete process of collecting x-ray
transmission data for the production of a tomogram. Data can be collected
simultaneously during a single scan for the production of one or more
tomograms.
(93) Scan time--The period of time between the beginning
and end of x-ray transmission data accumulation for a single scan.
(94) Scattered radiation--Radiation that has been deviated
in direction during passage through matter.
(95) Secondary protective barrier--See definition for
protective barrier.
(96) Shallow dose equivalent (Hs )
(that applies to the external exposure of the skin of the whole body
or the skin of an extremity)--The dose equivalent at a tissue depth
of 0.007 cm (7 milligrams per square centimeter).
(97) Shutter--A device attached to the tube housing
assembly that can totally intercept the useful beam and that has a
lead equivalency not less than that of the tube housing assembly.
(98) SI--The abbreviation for the International System
of Units.
(99) Sievert (Sv)--The SI unit of any of the quantities
expressed as dose equivalent. The dose equivalent in Sv is equal to
the absorbed dose in Gy multiplied by the quality factor (1 Sv = 100
rem.)
(100) Source-to-image receptor distance (SID)--The
distance from the source to the center of the input surface of the
image receptor.
(101) Source-to-skin distance (SSD)--The distance from
the source to the skin of the animal.
(102) Special units--The conventional units historically
used by registrants, i.e. rad (absorbed dose), and rem (dose equivalent).
(103) Spot film--A radiograph that is made during a
fluoroscopic examination to permanently record conditions that exist
during that fluoroscopic procedure.
(104) Stray radiation--The sum of leakage and scattered
radiation.
(105) Supervision--The delegating of the task of applying
radiation in accordance with this section to persons not licensed
in veterinary medicine, who perform tasks under the veterinarian's
control. The veterinarian assumes full responsibility for these tasks
and shall assure that the tasks will be administered correctly.
(106) Survey--An evaluation of the radiological conditions
and potential hazards incident to the production, use, transfer, disposal,
and presence of radiation machines. When appropriate, such survey
includes, tests, physical examination of location of radiation machines,
measurements of levels of radiation present, and evaluation of administrative
and engineered controls.
(107) Technique chart--A chart that provides technical
factors, anatomical examination, and animal size for examination being
performed needed to make clinical radiographs when the radiation machine
is in manual mode.
(108) Technique factors--The conditions of operation
that are specified as follows:
(A) for capacitor energy storage equipment, peak tube
potential in kV and quantity of charge in mAs;
(B) for field emission equipment rated for pulsed operation,
peak tube potential in kV and number of x-ray pulses;
(C) for CT systems designed for pulsed operations,
peak tube potential in kV, scan time in seconds, and either tube current
in mA, x-ray pulse width in seconds, and the number of x-ray pulses
per scan or the product of tube current, x-ray pulse width, and the
number of x-ray pulses in mAs;
(D) for CT systems not designed for pulsed operation,
peak tube potential in kV, and either tube current in mA and scan
time in seconds or the product of tube current and exposure time in
mAs when the scan time and exposure time are equivalent; and
(E) for all other x-ray systems, peak tube potential
in kV and either tube current in mA and exposure time in seconds or
the product of tube current and exposure time in mAs.
(109) Termination--A release by the agency of the obligations
and authorizations of the registrant under the terms of the certificate
of registration. It does not relieve a person of duties and responsibilities
imposed by law or rule.
(110) Texas Regulations for Control of Radiation--All
sections of Chapter 289 of this title.
Cont'd... |
