For the exposure of patients in diagnostic radiology, individual dose limit does not apply, but optimization of radiological protection may play a major role.

对于医学诊断中病人接受的剂量，个人剂量限值不适用，但放射防护最优化却可以发挥大的作用。

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The career dose limit for 30-to-60-year-old male astronauts who never smoked ranges from 800 to 1, 200 millisieverts.

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As for the 5m people who still live in contaminated areas, most have exposures to radiation that remain within the recommended dose limit.

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This week in Tokyo, Wade Allison, a physics professor at Oxford University, argued that Japan's dose limit could safely be raised to 100 millisieverts, based on current health statistics.

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