| (C) obtain reports of the individual's DE from prior or other current employer(s) for work involving radiation exposure, or the individual's current employer, if the individual is not employed by the registrant, by telephone, telegram, facsimile, or letter. The registrant shall request a written verification of the dose data if the authenticity of the transmitted report cannot be established. (3) The registrant shall record the exposure data for the current year, as required by paragraph (1) of this subsection, on RC Form 231-3, or other clear and legible record, of all the information required on RC Form 231-3. (4) If the registrant is unable to obtain a complete record of an individual's current occupational dose while employed by any other registrant or licensee, the registrant shall assume in establishing administrative controls in accordance with subsection (m)(6) of this section for the current year, that the allowable dose limit for the individual is reduced by 1.25 rems (12.5 millisieverts (mSv)) for each quarter; or 416 millirems (mrem) (4.16 mSv) for each month for which records were unavailable and the individual was engaged in activities that could have resulted in occupational radiation exposure. (5) If an individual has incomplete (for example, a lost or damaged personnel monitoring device) current occupational dose data for the current year and that individual is employed solely by the registrant during the current year, the registrant shall: (A) assume that the allowable dose limit for the individual is reduced by 1.25 rems (12.5 mSv) for each quarter; (B) assume that the allowable dose limit for the individual is reduced by 416 mrem (4.16 mSv) for each month; or (C) assess an occupational dose for the individual during the period of missing data using surveys, radiation measurements, or other comparable data for the purpose of demonstrating compliance with the occupational dose limits. (6) Administrative controls established in accordance with paragraph (4) of this subsection shall be documented and maintained for inspection by the agency. Occupational dose assessments made in accordance with paragraph (5) of this subsection and records of data used to make the assessment shall be maintained for inspection by the agency. The registrant shall retain the records in accordance with subsection (ll)(6) of this section. (s) General surveys and monitoring. (1) Each registrant shall make, or cause to be made, surveys that: (A) are necessary for the registrant to comply with this section; and (B) are necessary under the circumstances to evaluate: (i) the magnitude and extent of radiation levels; and (ii) the potential radiological hazards. (2) The registrant shall ensure that instruments and equipment used for qualitative and quantitative radiation measurements, for example, dose rate, are operable and calibrated: (A) by a person licensed or registered by the agency, another agreement state, a licensing state, or the NRC to perform such service; (B) at intervals not to exceed 12 months unless a different time interval is specified in another section of this chapter; (C) after each instrument or equipment repair; (D) for the types of radiation used and at energies appropriate for use; and (E) at an accuracy within 20% of the true radiation level. (3) All individual monitoring devices, except for direct and indirect reading pocket dosimeters, electronic personal dosimeters, and those individual monitoring devices used to measure the dose to any extremity, that require processing to determine the radiation dose and that are used by registrants to comply with subsection (m) of this section, with other applicable provisions of this chapter, shall be processed and evaluated by a dosimetry processor: (A) holding current personnel dosimetry accreditation from the National Voluntary Laboratory Accreditation Program (NVLAP) of the National Institute of Standards and Technology; and (B) approved in this accreditation process for the type of radiation or radiations included in the NVLAP program that most closely approximates the type of radiation or radiations for which the individual wearing the dosimeter is monitored. (t) Control of access to high radiation areas. (1) The registrant shall ensure that each entrance or access point to a high radiation area has one or more of the following features: (A) a control device that, upon entry into the area, causes the level of radiation to be reduced below that level at which an individual might receive a DDE of 0.1 rem (1 mSv) in one hour at 30 cm from the source of radiation from any surface that the radiation penetrates; (B) a control device that energizes a conspicuous visible or audible alarm signal so that the individual entering the high radiation area and the supervisor of the activity are made aware of the entry; or (C) 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 subsection for a high radiation area, the registrant may substitute continuous direct or electronic surveillance that is capable of preventing unauthorized entry. (3) The registrant may apply to the agency for approval of alternative methods for controlling access to high radiation areas. (4) The registrant shall establish the controls required by paragraphs (1) and (3) of this subsection in a way that does not prevent individuals from leaving a high radiation area. (5) The registrant is not required to control entrance or access to rooms or other areas containing radiation machines capable of producing a high radiation area as described in this subsection if the registrant has met all the specific requirements for access and control specified in other applicable sections of this chapter, such as §289.227 of this title (relating to Use of Radiation Machines in the Healing Arts), §289.229 of this title (relating to Radiation Safety for Accelerators, Therapeutic Radiation Machines, Simulators, and Electronic Brachytherapy Devices), and §289.255 of this title (relating to Radiation Safety Requirements and Licensing and Registration Procedures for Industrial Radiography). (u) Control of access to very high radiation areas. (1) In addition to the requirements in subsection (t) of this section, the registrant shall institute 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 500 rads (5 grays) or more in 1 hour at 1 m from a radiation machine or any surface through which the radiation penetrates at this level. (2) The registrant is not required to control entrance or access to rooms or other areas containing radiation machines capable of producing a very high radiation area as described in paragraph (1) of this subsection if the registrant has met all the specific requirements for access and control specified in other applicable sections of this chapter, such as §289.227 of this title, §289.229 of this title, and §289.255 of this title. (3) The entry control devices required by paragraphs (1) and (2) of this subsection shall be established in such a way that no individual will be prevented from leaving the area. (v) Security and control of radiation machines. (1) The registrant shall secure radiation machines from unauthorized removal. (2) The registrant shall use devices and/or administrative procedures to prevent unauthorized use of radiation machines. (w) Caution signs. Unless otherwise authorized by the agency, the standard radiation symbol prescribed shall use the colors magenta, or purple, or black on yellow background. The standard radiation symbol prescribed is the three-bladed design as follows: Attached Graphic (1) the cross-hatched area of the symbol is to be magenta, purple, or black; and (2) the background of the symbol is to be yellow. (x) Posting requirements. (1) The registrant shall post each radiation area with a conspicuous sign or signs bearing the radiation symbol and the words "CAUTION, RADIATION AREA." (2) The 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." Cont'd... |
