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Radioactive Waste Disposal at Sea: Public Ideas ... - IMO

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160 Chapter 9<br />

IAEA study requested by IGPRAD in 1987 summarized the rel<strong>at</strong>ive risks to<br />

a critical group th<strong>at</strong>, owing to the large quantities of seafood consumed and<br />

the higher concentr<strong>at</strong>ion of contaminants assumed in such foodstuffs,<br />

would be exposed to higher doses than any other group of individuals in the<br />

popul<strong>at</strong>ion (IAEA 1993, p. 35). (See figure 9.1.) The study showed th<strong>at</strong> the<br />

presence of n<strong>at</strong>urally occurring radionuclides could result in a risk gre<strong>at</strong>er<br />

than th<strong>at</strong> corresponding to the Intern<strong>at</strong>ional Commission on Radiological<br />

Protection’s dose limit for members of the public. Compared to th<strong>at</strong>, the<br />

study showed, the additional risks associ<strong>at</strong>ed with the contamin<strong>at</strong>ion of<br />

seafood from radwaste disposal were about five orders of magnitude lower.<br />

Moreover, it appeared th<strong>at</strong> the presence of PCBs could represent a risk similar<br />

to th<strong>at</strong> arising from n<strong>at</strong>urally occurring radionuclides. The study concluded<br />

th<strong>at</strong> the other chemicals represented risks th<strong>at</strong> were lower, rel<strong>at</strong>ive<br />

Figure 9.1<br />

Annual risk of f<strong>at</strong>al cancer induction associ<strong>at</strong>ed with the ingestion of radionuclides<br />

and organic chemical carcinogens by members of the most exposed group. Source:<br />

IAEA 1993, p. 35.

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