Dose Algorithm for EXTRAD 4100S Extremity Dosimeter for Use at Sandia National Laboratories

Technical Report · Sun May 01 00:00:00 EDT 2011

DOI:https://doi.org/10.2172/1044943· OSTI ID:1044943

Potter, Charles Augustus ^[1]

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1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

An updated algorithm for the EXTRAD 4100S extremity dosimeter has been derived. This algorithm optimizes the binning of dosimeter element ratios and uses a quadratic function to determine the response factors for low response ratios. This results in lower systematic bias across all test categories and eliminates the need for the 'red strap' algorithm that was used for high energy beta/gamma emitting radionuclides. The Radiation Protection Dosimetry Program (RPDP) at Sandia National Laboratories uses the Thermo Fisher EXTRAD 4100S extremity dosimeter, shown in Fig 1.1 to determine shallow dose to the extremities of potentially exposed individuals. This dosimeter consists of two LiF TLD elements or 'chipstrates', one of TLD-700 ({sup 7}Li) and one of TLD-100 (natural Li) separated by a tin filter. Following readout and background subtraction, the ratio of the responses of the two elements is determined defining the penetrability of the incident radiation. While this penetrability approximates the incident energy of the radiation, X-rays and beta particles exist in energy distributions that make determination of dose conversion factors less straightforward in their determination.

• Research Organization: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA)
• DOE Contract Number: AC04-94AL85000
• OSTI ID: 1044943
• Report Number(s): SAND--2012-3371
• Country of Publication: United States
• Language: English

Related Subjects

61 RADIATION PROTECTION AND DOSIMETRY
ALGORITHMS
BETA PARTICLES
DOSEMETERS
DOSIMETRY
ENERGY SPECTRA
RADIATION PROTECTION
RADIOISOTOPES
SANDIA NATIONAL LABORATORIES