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  • Subpart 38.25

Subpart 38.25

Radiation symbol, signs, labels and control devices.

(a) Standard radiation symbol. Unless otherwise authorized by this Part (rule) or by the commissioner, the symbol prescribed by this section shall use the colors magenta, purple, or black on yellow background. The symbol prescribed is the three-bladed design and shall be as illustrated below:

(1) Cross-hatched area is to be magenta, purple, or black.

(2) The background is to be yellow.

(3) Exception to color requirements for standard radiation symbol. Not withstanding the requirements of this subdivision, licensees or registrants are authorized to label sources, source holders, or device components containing sources of radiation, and which are subjected to high temperatures, with conspicuously etched or stamped radiation caution symbols and without a color requirement.

(4) Additional information on signs and labels. In addition to the contents of signs and labels prescribed in this Part, the licensee or registrant shall provide, on or near the required signs and labels, additional information, as appropriate, to make individuals aware of potential radiation exposures and to minimize the exposures.

(b) (1) Posting requirements.

(i) Posting of radiation areas. The licensee or registrant shall post each radiation area with a conspicuous sign or signs bearing the radiation symbol and the words "CAUTION, RADIATION AREA".

(ii) Posting of high radiation areas. The licensee or registrant shall post each high radiation area with a conspicuous sign or signs bearing the radiation symbol and the words "CAUTION, HIGH RADIATION AREA" or "DANGER, HIGH RADIATION AREA".

(iii) Posting of very high radiation areas. The licensee or registrant shall post each very high radiation area with a conspicuous sign or signs bearing the radiation symbol and words "GRAVE DANGER, VERY HIGH RADIATION AREA".

(iv) Posting of airborne radioactivity areas. The licensee or registrant shall post each airborne radioactivity area with a conspicuous sign or signs bearing the radiation symbol and the words "CAUTION, AIRBORNE RADIOACTIVITY AREA" or "DANGER, AIRBORNE RADIOACTIVITY AREA".

(v) Posting of areas or rooms in which licensed or registered material is used or stored. The licensee or registrant shall post each area or room in which there is used or stored an amount of licensed or registered material exceeding 10 times the quantity of such material specified in Table 4 of section 38.41 of this Part (rule) with a conspicuous sign or signs bearing the radiation symbol and the words "CAUTION, RADIOACTIVE MATERIAL(S)" or "DANGER, RADIOACTIVE MATERIAL(S)".

(2) Exceptions to posting requirements.

(i) A licensee or registrant is not required to post caution signs in areas or rooms containing sources of radiation for periods of less than eight hours, if each of the following conditions is met:

(a) the sources of radiation are constantly attended during these periods by an individual who takes the precautions necessary to prevent the exposure of individuals to sources of radiation in excess of the limits established in this Part (rule); and

(b) the area or room is subject to the licensee's or registrant's control.

(ii) A room or area is not required to be posted with a caution sign because of the presence of a sealed source provided the radiation level at 30 centimeters from the surface of the sealed source container or housing does not exceed 0.05 mSv (0.005 rem) per hour.

(c) Labeling containers and radiation machines.

(1) The licensee or registrant shall ensure that each container of licensed or registered material bears a durable, clearly visible label bearing the radiation symbol and the words "CAUTION, RADIOACTIVE MATERIAL" or "DANGER, RADIOACTIVE MATERIAL". The label shall also provide information, such as the radionuclides present, an estimate of the quantity of radioactivity, the date for which the activity is estimated, radiation levels, kinds of materials, and mass enrichment, sufficient to permit individuals handling or using containers, or working in the vicinity of the containers, to take precautions to avoid or minimize exposures.

(2) Each licensee shall, prior to removal or disposal of empty uncontaminated containers to unrestricted areas, remove or deface the radioactive material label or otherwise clearly indicate that the container no longer contains radioactive materials.

(3) Each registrant shall ensure that each radiation machine is labeled in a conspicuous manner which cautions individuals that radiation is produced when it is energized.

(4) Exceptions to labeling requirements. A licensee or registrant is not required to label:

(i) containers holding licensed material in quantities less than the quantities listed in Table 4 of section 38.41 of this Part (rule);

(ii) containers holding licensed material in concentrations less than thosespecified in Appendix A-13, Table III of section 38.41 of this Part (rule);

(iii) for laboratory containers, such as beakers, flasks, and test tubes, used transiently in laboratory procedures (i.e. for a period of a few hours) in the presence of an authorized user;

(iv) containers holding licensed material when they are in transport and packaged and labeled in accordance with the regulations of the U.S. Department of Transportation for radioactive material;

(v) containers that are accessible only to individuals authorized to handle or use them, or to work in the vicinity of the containers, if the contents are identified to these individuals by a readily available written record. Examples of containers of this type are containers in locations such as water-filled canals, storage vaults, or hot-cells. The record shall be retained as long as the containers are in use for the purpose indicated on the record; or

(vi) installed manufacturing or process equipment, such as chemical process equipment, piping, and tanks.

(d) Control of access to high radiation areas.

(1) The licensee or registrant shall ensure that each entrance or access point to a highradiation area has one or more of the following features:

(i) a control device that, upon entry into the area, causes the level of radiationto be reduced below that level at which an individual might receive a deep dose equivalent of 1 mSv (0.1 rem) in one hour at 30 centimeters from the source of radiation or from any surface that the radiation penetrates;

(ii) a control device that energizes a conspicuous visible or audible alarmsignal so that the individual entering the high radiation area, and the supervisor of the activity, are made aware of the entry; or

(iii) entryways that are locked, except during periods when access to the areas is required, with positive control over each individual entry.

(2) In place of the controls required by paragraph (1) of this subdivision, the licensee or registrant may substitute continuous direct or electronic surveillance that is capable of preventing unauthorized entry.

(3) The licensee or registrant may use alternative methods for controlling access tohigh radiation areas if they are approved by the commissioner as effective at accomplishing such control.

(4) The licensee or registrant shall establish the controls required by paragraphs (1)and (3) of this subdivision in a way that does not prevent individuals from leaving a high radiation area.

(5) The licensee or registrant is not required to control each entrance or access point to a room or other area that is a high radiation area solely because of the presence of radioactive materials prepared for transport and packaged and labeled in accordance with the regulations of the U.S. Department of Transportation for radioactive material, provided that:

(i) the packages do not remain in the area longer than three days; and

(ii) the dose rate at one meter from the external surface of any package doesnot exceed 0.1 mSv (0.01 rem) per hour.

(e) Control of access to very high radiation areas.In addition to the requirements insubdivision (d) of this section, the licensee or registrant shall institute additional measures to ensure that an individual is not able to gain unauthorized or inadvertent access to areas in which radiation levels could be encountered at 5 Gy (500 rad) or more in one hour at one meter from a source of radiation or any surface through which the radiation penetrates. This requirement does not apply to radiation sources subject to subdivision (f) of this section.

(f) Control of access to very high radiation areas-irradiators.

(1) This subdivision applies to licensees or registrants with sources of radiation innon-self-shielded irradiators. This subdivision does not apply to sources of radiation that are used in industrial radiography, or in completely self-shielded irradiators in which the source of radiation is both stored and operated within the same shielding radiation barrier and, in the designed configuration of the irradiator, is always physically inaccessible to any individual and cannot create a radiation level of 5 Gy (500 rad) or more in one hour at one meter in an area that is accessible to any individual.

(2) Each area in which there may exist radiation levels in excess of 5 Gy (500 rad) in one hour at one meter from a source of radiation that is used to irradiate materials shall meet the following requirements:

(i) Each entrance or access point shall be equipped with entry control deviceswhich:

(a) function automatically to prevent any individual from inadvertentlyentering a very high radiation area;

(b) permit deliberate entry into the area only after a control device isactuated that causes the radiation level within the area, from the source of radiation, to be reduced below that at which it would be possible for an individual to receive a deep dose equivalent in excess of 1 mSv (0.1 rem) in one hour; and

(c) when actuated, prevent operation of the source of radiation if itwould produce radiation levels in the area that could result in a deep dose equivalent to an individual in excess of 1 mSv (0.1 rem) in one hour.

(ii) Additional control devices shall be provided so that, upon failure of theentry control devices to function as required by subparagraph (i) of this paragraph:

(a) the radiation level within the area, from the source of radiation, isreduced below that at which it would be possible for an individual to receive a deep dose equivalent in excess of 1 mSv (0.1 rem) in one hour; and

(b) conspicuous visible and audible alarm signals are generated tomake an individual attempting to enter the area aware of the hazard as well as at least one other authorized individual, who is physically present, familiar with the activity and prepared to render or summon assistance, aware of the failure of the entry control devices.

(iii) The licensee or registrant shall provide control devices so that, upon failure or removal of physical radiation barriers other than the sealed source's shielded storage container:

(a) the radiation level from the source of radiation is reduced belowthat at which it would be possible for an individual to receive a deep dose equivalent in excess of 1 mSv (0.1 rem) in one hour; and

(b) conspicuous visible and audible alarm signals are generated tomake potentially affected individuals aware of the hazard; as well as to make the licensee or registrant or at least one other individual, who is familiar with the activity and prepared to render or summon assistance, aware of the failure or removal of the physical barrier.

(iv) When the shield for stored sealed sources is a liquid, the licensee orregistrant shall provide means to monitor the integrity of the shield and to signal, automatically, loss of shielding to a level at which it would be possible for an individual to receive a deep dose equivalent in excess of 1 mSv (0.1 rem) in one hour.

(v) Physical radiation barriers that comprise permanent structural components,such as walls, that have no credible probability of failure or removal in ordinary circumstances need not meet the requirements of subparagraphs (iii) and (iv) of this paragraph.

(vi) Each area shall be equipped with devices that will automatically generateconspicuous visible and audible alarm signals to alert personnel in the area before the source of radiation can be put into operation, and in time for any individual in the area to operate a clearly identified control device which must be installed in the area, and which will prevent the source of radiation from being put into operation.

(vii) Each area shall be controlled by use of such procedures and devices as are necessary to ensure that the area is cleared of personnel prior to each use of the source of radiation.

(viii) Prior to the first individual's entry into each very high radiation areaafter any use of the source of radiation, the area shall be checked by a radiation measurement. The area may not be used unless the radiation level from the source of radiation in the area is below that at which it would be possible for an individual to receive a deep dose equivalent in excess of 1 mSv

(0.1 rem) in one hour.

(ix) The entry control devices required in subparagraph (i) of this paragraph shall have been tested for proper functioning as follows:

(a) testing shall be conducted prior to initial operation with the sourceof radiation on any day, unless operations were continued uninterrupted from the previous day;

(b) testing shall be conducted prior to resumption of operation of thesource of radiation after any unintentional interruption; and

(c) the licensee or registrant shall submit and adhere to a schedule forperiodic tests of the entry control and warning systems.

(x) The licensee or registrant shall not conduct operations, other than those necessary to place the source of radiation in safe condition or to effect repairs on controls, unless control devices are functioning properly.

(xi) Entry and exit portals that are used in transporting materials to and from the irradiation area, and that are not intended for use by individuals, shall be controlled by such procedures and devices as are necessary to physically protect and warn against inadvertent entry by any individual through these portals. Exit portals for irradiated materials shall be equipped to detect and signal the presence of any loose radioactive material that is carried toward such an exit and to automatically prevent loose radioactive material from being carried out of the area.

(3) Licensees, registrants, or applicants for licenses or registrations for sources ofradiation within the purview of this subdivision which will be used in a variety of positions or in locations, such as open fields or forests, that make it impracticable to comply with certain requirements of paragraph (2) of this subdivision, such as those for the automatic control of radiation levels, may apply to the commissioner for approval of alternative safety measures. Alternative safety measures shall provide personnel protection at least equivalent to those specified in paragraph (2) of this subdivision. At least one of the alternative measures shall include an entry-preventing interlock control based on a measurement of the radiation present that ensures the absence of high radiation levels before an individual can gain access to the area where such sources of radiation are used.

(4) The entry control devices required by paragraphs (2) and (3) of this subdivisionshall be established in such a way that no individual will be prevented from leaving
the area.

Historical Sec. amd. filed June 10, 1971; repealed, new filed: July 6, 1978; June 9, 1994 eff. Note: June 29, 1994.

 

 

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