ANSI HPS-N13.41-2011 pdf download Criteria for Performing Multiple Dosimetry
5.1 Dosimeter Type The dosimeter type selected for multiple dosimetry programs shall be appropriate for measuring the type and intensity of radiation expected in light of dosimeter detection limits. As a minimum, the dosimeter(s) used should meet the criteria of ANSI/HPS N1 3.1 1 and N1 3.32 (ANSI/HPS 2008, 2009). The physical size and shape of the dosimeter assembly should be considered when selecting the appropriate device for placement on various areas of the body.
5.2 Dosimeter Placement The dosimeter(s) used for routine monitoring shall be considered the reference dosimeter. If multiple dosimetry is required for specific jobs or tasks, the reference dosimeter shall be removed and replaced with another dosimeter positioned at the same location for the duration of the period of multiple dosimetry. The reference dosimeter location shall have a dosimeter assigned at all times so that a common measurement point is maintained, and a dose can be assessed for only the reference dosimeter location, if appropriate. Supplemental dosimeters shall be placed at body positions that permit assessment of the highest exposures, as determined from pre-job radiation surveys and evaluations of worker movement and position relative to the radiation source(s).
The physical placement of multiple dosi- meters should be consistent with the prin- ciple of maintaining radiation doses as low as reasonably achievable (ALARA). Dosi- meter placement and use that may result in decreased worker efficiency and corre- sponding increases in dose shall be avoided. The location on the body of supplemental dosimeters shall be clearly documented. Once their locations have been determined, they shall be worn in a fashion consistent with calibration and dosimeter performance characteristics (e.g., flat to the body for dosimeters designed to register albedo effects; oriented with any “windows” facing outward).