Extended conversion coefficients for use in radiation protection of the embryo and fetus against external neutrons from 10 MeV to 100 GeV

Health Physics
Jing Chen

Abstract

External neutron exposure is of concern in the environment and in some workplaces. Dose assessments for neutrons frequently rely on fluence-to-absorbed dose conversion coefficients. A problem of concern in radiation protection is exposure of pregnant women to ionizing radiation because of the high radiosensitivity of the embryo and fetus. While neutron fluence-to-dose conversion coefficients for adults are recommended in ICRP publications and ICRU reports, conversion coefficients for embryos and fetuses are not given in the publications. This study uses the Monte Carlo code MCNPX to determine mean absorbed doses to the embryo and fetus when the mother is exposed to neutron fields. A previous study has dealt with neutrons from 1 eV to 10 MeV. In this study, monoenergetic neutrons ranging from 10 MeV to 100 GeV are considered. The irradiation geometries include antero-posterior, postero-anterior, lateral, rotational, and isotropic. At each of these standard irradiation geometries, absorbed doses to the fetal brain and body are calculated for the embryo of 8 wk and the fetus of 3, 6, or 9 mo. Neutron fluence-to-absorbed dose conversion coefficients are derived for the four prenatal ages. The results showed that the fetus at about ...Continue Reading

References

Oct 25, 2000·Health Physics·H G MenzelD Bartlett
Sep 7, 2001·Radiation Protection Dosimetry·B J LewisJ R Brisson
Sep 9, 2004·Radiation Protection Dosimetry·Lennart LindborgFrantisek Spurny
Sep 9, 2004·Radiation Protection Dosimetry·M Králík, K Turek
Sep 9, 2004·Radiation Protection Dosimetry·Konstanze Gunzert-MarxReinhard S Simon
Sep 9, 2004·Radiation Protection Dosimetry·Jing ChenSlavica Vlahovich
Sep 9, 2004·Radiation Protection Dosimetry·T Bolognese-MilsztajnD Derdau
Apr 30, 2005·Radiation Protection Dosimetry·J ChenB L Tracy

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