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Report No.

Exposure inhomogeneity from $$^{241}$$Am and $$^{90}$$Sr/$$^{90}$$Y sources in terms of the eye lens monitoring in the nuclear facilities

Yoshitomi, Hiroshi; Kowatari, Munehiko

This paper highlights the issues of exposure inhomogeneity that are relative to eye lens monitoring for low-energy photons from $$^{241}$$Am and beta-rays from $$^{90}$$Sr/$$^{90}$$Y including a personal protective equipment because eye lens exposure has been concerned more than before due to the proposed reduction of relevant dose limit. These nuclides are common sources in the nuclear industry, which are particularly of concern. Our previous study presented a quantitative estimation of exposure inhomogeneity, which was applied to simple but typical exposure situations to the radionuclides. For the present study, exposure inhomogeneity of $$^{241}$$Am was approximately within a factor of 1.6, implying a rather homogeneous situation than expected. Regarding $$^{90}$$Sr/$$^{90}$$Y exposure, estimation from both $$H_{rm p}$$(10) and $$H_{rm p}$$(0.07) on trunk would lead to an over- or underestimation by a factor of more than ten. In contrast, $$H_{rm p}$$(3) measurement on trunk will improve by up to a factor of two. With respect to the personal protective equipment, lead apron and protective glasses are effective for the 60-keV photons for both anterior-posterior (AP) and rotational (ROT) irradiations, while a full-face respirator can reduce the eye lens dose by approximately 17% for $$^{90}$$Sr/$$^{90}$$Y betas. As a whole, this study demonstrated that the effect of protective equipment can be effectively incorporated into the homogeneity evaluation.



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Category:Environmental Sciences



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