Radiation Dose Assessments for Shore-Based Individuals in Operation Tomodachi

Radiation Dose Assessments for Fleet-Based Individuals in Operation Tomodachi

“…The calculated thyroid dose is significantly less than the U.S. annual occupational organ dose limit of 500 mSv (50 rem). In addition, when compared to doses for shore-based individuals, the maximum total effective dose for ship-based individuals of 0.35 mSv (0.035 rem) is approximately four times lower than the maximum effective dose of 1.2 mSv (0.12 rem) calculated for DOD-affiliated individuals at 13 shore-based locations in Cassata et al (2012). A comparison of the thyroid doses for ship-based and shore-based individuals shows a similar pattern.…”

“…Those comparisons showed that in all the scenarios evaluated at the four locations, including Yokosuka NB, the total effective doses and total equivalent doses to the thyroid estimated by deterministic methods were much higher than the 95 th percentile values determined using the probabilistic method (Chehata et al, 2013). Since the methods of Cassata et al (2012) were used for the calculation of in-port doses in this report, it is reasonable to conclude that the in-port doses in this report are also conservative.…”

“…The results of probabilistic analysis of shore-based doses reported in Chehata et al (2013) provided further support that doses reported herein are high sided. In that report, probabilistic analyses were performed for four locations including Yokosuka NB to provide a basis for comparison with the doses estimated by deterministic methods reported in Cassata et al (2012). Those comparisons showed that in all the scenarios evaluated at the four locations, including Yokosuka NB, the total effective doses and total equivalent doses to the thyroid estimated by deterministic methods were much higher than the 95 th percentile values determined using the probabilistic method (Chehata et al, 2013).…”

“…Scientific Committee 6-8 of the National Council on Radiation Protection and Measurements (NCRP) reviewed this report and stated that the estimated doses to shipboard personnel were very small and radiologically insignificant. In addition, the in-port doses were calculated using the shore-based dose calculation methodology of Cassata et al (2012), which was reviewed by the same NCRP committee, which concluded that those doses were high-sided.…”

Comparison of Radiation Dose Studies of the 2011 Fukushima Nuclear Accident Prepared by the World Health Organization and the U.S. Department of Defense

“…It subsequently established the Dose Assessment and Recording Working Group (DARWG) within a few months after the FDNPS nuclear accident to carry out radiation dose assessments for military personnel and other DODaffiliated persons who were in Japan during the 60-day period from March 12 to May 11, 2011. The DOD/DARWG published its findings in a September 2012 report "Radiation Dose Assessments for Shore-Based Individuals in Operation Tomodachi" (Cassata et al, 2012).…”