12 Va. Admin. Code § 5-481-680 - Determination of prior occupational dose
A. For each individual who may enter the
licensee 's or registrant's restricted area and is likely to receive, in a year,
an occupational dose requiring monitoring pursuant to
12VAC5-481-760, the licensee or
registrant shall determine the occupational radiation dose received during the
current year.
B. Prior to
permitting an individual to participate in a planned special exposure , the
licensee or registrant shall determine:
1. The
internal and external doses from all previous planned special exposures;
and
2. All doses in excess of the
limits, including doses received during accidents and emergencies, received
during the lifetime of the individual.
C. In complying with the requirements of
subsection A or B of this section, a licensee or registrant may:
1. Accept, as a record of the occupational
dose that the individual received during the current year, a written signed
statement from the individual, or from the individual's most recent employer
for work involving radiation exposure, that discloses the nature and the amount
of any occupational dose that the individual received during the current
year;
2. Accept, as the record of
lifetime cumulative radiation dose , an up-to-date occupational radiation
exposure form provided by the agency or equivalent, signed by the individual
and countersigned by an appropriate official of the most recent employer for
work involving radiation exposure, or the individual's current employer, if the
individual is not employed by the licensee or registrant; and
3. Obtain reports of the individual's dose
equivalent from the most recent employer for work involving radiation exposure,
or the individual's current employer, if the individual is not employed by the
licensee or registrant, by telephone, telegram, facsimile, or letter. The
licensee or registrant shall request a written verification of the dose data if
the authenticity of the transmitted report cannot be established.
D. Do the following:
1. The licensee or registrant shall record
the exposure history, as required by this section on an occupational radiation
exposure form provided by the agency , or other clear and legible record, of all
the information required on that form. The form or record shall show each
period in which the individual received occupational exposure to radiation or
radioactive material and shall be signed by the individual who received the
exposure. For each period for which the licensee or registrant obtains reports,
the licensee or registrant shall use the dose shown in the report in preparing
the occupational radiation exposure form provided by the agency or equivalent.
For any period in which the licensee or registrant does not obtain a report,
the licensee or registrant shall place a notation on the occupational radiation
exposure form provided by the agency or equivalent indicating the periods of
time for which data are not available.
2. Licensees or registrants are not required
to partition historical dose between external dose equivalent(s) and internal
committed dose equivalent (s). Further, occupational exposure histories obtained
and recorded on the occupational radiation exposure form provided by the agency
or equivalent before September 20, 2006, might not have included effective dose
equivalent, but may be used in the absence of specific information on the
intake of radionuclides by the individual.
E. If the licensee or registrant is unable to
obtain a complete record of an individual's current and previously accumulated
occupational dose , the licensee or registrant shall assume:
1. In establishing administrative controls
pursuant to
12VAC5-481-640 for the current
year , that the allowable dose limit for the individual is reduced by 12.5 mSv
(1.25 rem) for each quarter for which records were unavailable and the
individual was engaged in activities that could have resulted in occupational
radiation exposure; and
2. That the
individual is not available for planned special exposures.
F. The licensee or registrant shall retain
the records on an occupational radiation exposure form provided by the agency
or equivalent until the agency terminates each pertinent license or
registration requiring this record. The licensee or registrant shall retain
records used in preparing the occupational radiation exposure form provided by
the agency or equivalent for three years after the record is made.
Notes
Statutory Authority
§ 32.1-229 of the Code of Virginia.
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