SECTION 310:281-9-3. Determination of accumulated occupational dose.

(a)   Excess of quarterly occupational dose.

(1)   Each permittee shall require any individual, prior to first entry of the individual into the permittee's restricted area during each employment or work assignment under such circumstances that the individual will receive or is likely to receive in any period of one calendar quarter an occupational dose in excess of 25 percent of the applicable standards specified in 310:281-9-2(a) and 310:281-9-5, to disclose in a written, signed statement, either;

(A)   that the individual had no prior occupational dose during the current calendar quarter, or

(B)   the nature and amount of any occupational dose which the individual may have received during the specifically identified current calendar quarter from sources of radiation used or controlled by other persons.

(2)   Each permittee shall maintain records of such statements until the Department authorizes disposition.

(b)   Previously accumulated occupational doses.

(l)   In the preparation of a form provided by the Department or a clear and legible record containing all the information required in that form, the permittee shall make a reasonable effort to obtain reports of the individual's previously accumulated occupational dose. For each period for which the permittee obtains such reports, he shall use the dose shown in the report in preparing the form. In any case where a permittee is unable to obtain reports of the individual's occupational dose for a previous complete calendar quarter, it shall be assumed that the individual has received the occupational dose specified in 310:281-9-3(b)(2) and (3).

(2)   Assumed dose in Rems for calendar quarters prior January 1, 1961 for wholebody gonads is 3 ¾ for active blood forming organs, head, trunk and lens of eye.

(3)   Assumed dose in Rems for calendar quarters beginning on or after January 1, 1961 is 1 ¼ for active blood forming organs, head, trunk and lens of eye.

(4)   The permittee shall retain and preserve records used in preparing forms required by the Department until the Department authorizes their disposition.

(c)   Determination of occupational effective dose for individuals wearing protective lead clothing during diagnostic x-ray procedures. When a protective apron is worn while working with radiographic and fluoroscopic x-ray systems used for clinical diagnostic or research purposes, the effective dose equivalent (EDE) for external radiation shall be determined as follows:

(1)   When only one personal monitoring device (310:281-9-12) is used and it is located at the neck (collar) outside the protective apron, the deep dose equivalent (DDE) shall be the EDE for external radiation; or

(2)   When only one personal monitoring device is used and it is located at the neck (collar) outside the protective apron, the reported DDE value will be multiplied by 0.3 shall be the EDE for external radiation; or

(3)   When personal monitoring devices are worn, both under the protective apron at the waist and outside the protective apron at the neck (collar), the EDE for external radiation shall be assigned the value of the sum of the DDE reported for the personal monitoring device located at the waist under the protective apron multiplied by 1.5 and the DDE reported for the personal monitoring device located at the neck (collar) outside the protective apron multiplied by 0.04.

[Source: Added at 8 Ok Reg 3503, eff 8-15-91 (emergency); Added at 9 Ok Reg 1643, eff 5-29-92; Amended at 21 Ok Reg 1037, eff 5-13-04]