As a result, federal agencies require phone manufacturers to post information about how much radiation the body might absorb for each model, called its Specific Absorption Rate or SAR.
因此联邦机构要求手机制造商标明人体可能会从每部手机吸收多少放射物，这又被称作电磁波能量(SAR)。
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You can get an idea of the relative amounts of radiation various cellphone models emit by looking at their SAR, or specific absorption rate.
你可以通过查看不同手机型号的吸收率，来了解手机的辐射。
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It was not until the 1950s that scientists had both good data on the absorption of infrared radiation, and digital computers that could speed through the multitudinous calculations.