Accuracy of effective dose estimation in personal dosimetry: a comparison between single-badge and double-badge methods and the MOSFET method.

Published

Journal Article

The purpose of this study was three-fold: (1) to measure the transmission properties of various lead shielding materials, (2) to benchmark the accuracy of commercial film badge readings, and (3) to compare the accuracy of effective dose (ED) conversion factors (CF) of the U.S. Nuclear Regulatory Commission methods to the MOSFET method. The transmission properties of lead aprons and the accuracy of film badges were studied using an ion chamber and monitor. ED was determined using an adult male anthropomorphic phantom that was loaded with 20 diagnostic MOSFET detectors and scanned with a whole body CT protocol at 80, 100, and 120 kVp. One commercial film badge was placed at the collar and one at the waist. Individual organ doses and waist badge readings were corrected for lead apron attenuation. ED was computed using ICRP 103 tissue weighting factors, and ED CFs were calculated by taking the ratio of ED and badge reading. The measured single badge CFs were 0.01 (±14.9%), 0.02 (±9.49%), and 0.04 (±15.7%) for 80, 100, and 120 kVp, respectively. Current regulatory ED CF for the single badge method is 0.3; for the double-badge system, they are 0.04 (collar) and 1.5 (under lead apron at the waist). The double-badge system provides a better coefficient for the collar at 0.04; however, exposure readings under the apron are usually negligible to zero. Based on these findings, the authors recommend the use of ED CF of 0.01 for the single badge system from 80 kVp (effective energy 50.4 keV) data.

Full Text

Duke Authors

Cited Authors

  • Januzis, N; Belley, MD; Nguyen, G; Toncheva, G; Lowry, C; Miller, MJ; Smith, TP; Yoshizumi, TT

Published Date

  • May 2014

Published In

Volume / Issue

  • 106 / 5

Start / End Page

  • 551 - 557

PubMed ID

  • 24670903

Pubmed Central ID

  • 24670903

Electronic International Standard Serial Number (EISSN)

  • 1538-5159

Digital Object Identifier (DOI)

  • 10.1097/HP.0b013e3182a82d3b

Language

  • eng

Conference Location

  • United States