Conclusions and Recommendations
On the basis of information presented in the report, the committee concentrated on three main subjects for assessing the five issues posed in the statement of task:
Risks and Benefits of Potassium Iodide Distribution
Implementation Issues Related to Potassium Iodide Distribution and Stockpile Programs
Additional Research Needed
Risks and Benefits Posed by Potassium Iodide Distribution
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Conclusions
Conclusion 1: Exposure of susceptible populations to radioiodine from a radiation incident increases the risk of thyroid cancer and other thyroid disorders.
Conclusion 2: Potassium Iodide (KI) is an important agent for protection against thyroid-related health effects of exposure to radioiodine, if taken shortly before or after exposure.
Conclusion 3: In planning for responses to nuclear incidents in the United States, the likelihood and possible magnitude and extent of a release in the United States cannot be extrapolated from the Chornobyl accident, because of substantial safety and other facility-design features in US reactors.
Recommendations
Recommendation 1: Potassium iodide (KI) should be available to everyone at risk of significant health consequences from accumulation of radioiodine in the thyroid in the event of a radiological incident. KI should be available to infants, children, and pregnant and lactating women. There is little benefit in providing KI to adults over 40 years old. To be most effective, KI must be taken within a few hours before or after exposure to inhaled or ingested radioiodine.
Recommendation 2: KI distribution should be included in the planning for comprehensive radiological incident response programs for nuclear power plants. KI distribution programs should consider predistribution, local stockpiling outside the emergency planning zone (EPZ), and national stockpiles and distribution capacity.
Recommendation 3: FDA should re-evaluate current dosing recommendations and consider extending the shelf-life for KI tablets stockpiled or distributed for use in response to a radiological incident involving radioiodine.
Implementation Issues Related to Potassium Iodide Distribution and Stockpile Programs
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Conclusion
A strategy is needed whereby local planning agencies could develop geographic boundaries for a KI distribution plan based on site-specific considerations because conditions and states vary so much that no single best solution exists.
Recommendations
Recommendation 1: A better understanding of the strengths and weaknesses, short-term and long-term successes and failures, and resource requirements of different KI distribution plans implemented in the United States and abroad would be extremely helpful for designing and implementing effective future KI distribution programs.
Recommendation 2: State and local authorities should make the decision regarding implementation and structure of a KI distribution program. The choice of program should be based on how well specific plans would perform on decision objectives, given features of the local region. The decision regarding the geographical area to be covered in a KI distribution program should be based on risk estimates derived from calculations of site-specific averted thyroid doses for the most vulnerable populations.
Recommendation 3: KI distribution and administration plans developed at the state and local level should receive federal resources for implementation and maintenance.
Recommendation 4: The federal government should maintain stockpiles and a distribution system as a supplement to states' programs to assure availability of KI to affected populations in the event of a major radiological incident involving radioiodine.
Recommendation 5: The federal government should ensure an adequate supply of KI tablets in suitable dosages for use by the target populations of infants, children, adults under 40 years old, and pregnant and lactating women of all ages.
Additional Research Needed
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Conclusion
Although questions remain regarding long-term health risks from radioiodine, particularly among potentially high-risk subgroups, there is now sufficient medical and scientific literature to estimate dose-related thyroid cancer risks following exposure to radioactive iodine.
Recommendations
Recommendation 1: KI distribution plans should include a carefully developed and tested public education program with continuing evaluation to ensure effectiveness and continued access to KI by the appropriate population.
Recommendation 2: A national program should be developed for follow-up of all individuals to whom KI was administered following a radiological incident, to assess short- and long-term health effects of KI administration.
Recommendation 3: Research is needed in a number of areas to provide better information to inform policy-makers and health-care providers about the risks posed by radioiodine exposure and methods to minimize long-term health effects. An evaluation of the strengths and weaknesses, successes and failures (short-term and long-term), and resource requirements of the different KI distribution plans implemented in the US and abroad should be conducted by a federal agency to aid states and local regions in designing and implementing effective KI distribution programs.
Conclusions and Recommendations
