HPS ANSI/HPS N13.41

The final decision on whether to use multiple dosimeters forexternal dosimetry purposes instead of a strategically placedsingle dosimeter is left to the judgment of radiation ANSI/HPSN13.41-2011 2 protection professionals. Once multiple dosimeter usehas been deemed appropriate, this standard contains criteriaapplicable to routine occupational activities on when and how touse them to monitor the body and extremities of individuals exposedto external sources of ionizing radiation. Such conditions may beencountered at medical, research, commercial, weapons disposition,fuel processing, power reactors and other sites. In addition,recommendations for selecting dosimeter types, placement ofdosimeters on the body, interpretation of multiple dosimeterresults, and recording of dose information are presented. A programthat is compliant with this standard shall include the requirementsof the standard, but not necessarily its recommendations.

This standard does not address the cases of internal depositionof radioactive materials, external contamination of the body, orworking conditions that do not permit job pre-planning. Sudden orunexpected changes in the radiation environment as might occurduring accidents are also beyond the scope of this standard. Fetalmonitoring is not addressed because it represents a special casenot necessarily related to nonuniform irradiation. (Fetalmonitoring is for the purpose of estimating the dose to a separateentity, the fetus, and demonstrating an appropriate rate ofequivalent dose accumulation for the period of gestation. Since itis not an example of multiple dosimetry, it is not addressedherein.¹) Skin exposures where the area of irradiationis less than 10 cm² (e.g., from a hot particle) are notaddressed.² Finally, the recommendations of thisstandard do not supercede specific regulations or licenserequirements.

This standard assumes that dosimeter assemblies worn formultiple dosimetry purposes are calibrated and processed toprovide an estimate of equivalent dose. Specific guidance ondosimeter processing methodologies, calibrations, and performancecriteria are included only by reference.

¹The dose to the fetus from external sources is oftenassessed by mounting a dosimeter on the abdomen of the pregnantworker.

²The National Council on Radiation Protection andMeasurements, in NCRP Report No. 106, Limit for Exposure to”Hot Particles” on the Skin, provides guidance on assessingthe radiation exposure of small skin areas (NCRP 1999).

Edition:

01

Published:

10/17/2011

ANSI:

ANSI Approved

Number of Pages:

25

File Size:

1 file , 240 KB