求翻译：7. Everything to do with radiation moves at an insidiously slow pace. Exposure to radioactive particles increases the risk of cancer, but the level of the danger depends on the dose and the age and health of the affected population. When radiation does kill, it can still take years. Around Chernobyl, no accurate dose estimates on the most heavily affected population were made until after the breakup of the Soviet Union, and, as a result, Belarus, Russia and Ukraine all use different techniques for measuring exposure.是什么意思？

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