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Radiation Protection Dosimetry 93:215-221 (2001)
© 2001 Oxford University Press

Effect of Angular Response Properties of Personal Dosemeters on the Estimation of Effective Dose Using Two Dosemeters

C.H. Kim and W.D. Reece

Even though the two-dosemeter approach successfully solved the underestimation problem of the single-dosemeter approach for posterior incident radiations, this approach significantly overestimates effective dose for the lateral and overhead beam directions when isotropic-responding dosemeters are used for measurement. This kind of overestimation can be reduced by using anisotropic-responding dosemeters whose responses decrease as the incident angle increases, i.e. from 0o (normal incidence) to 90o (lateral incidence). To quantify the reduction of overestimation by using anisotropic-responding dosemeters, this study applied the two-dosemeter approach to several types of anisotropic-responding dosemeters - both ideal and commercial - and then compared the results with those of isotropic-responding dosemeters. This study also derived a set of angular response factors (ARF) which can be used to develop a personal dosemeter with ideal angular response properties for use in the two-dosemeter approach.


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