| Becquerel |
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In a fixed mass of radioactive material, the number of becquerels changes with time. In some circumstances, amounts of radioactive material are given after adjustment for some period of time. For example, one might quote a ten-day adjusted figure, that is, the amount of radioactivity that will still be present after ten days. This deemphasizes short-lived isotopes. It was designated, in the SI, to use the becquerel rather than the reciprocal second for the activity measure unit. This unit was specifically introduced because of the dangers to human health which might arise from mistakes involving the units reciprocal second. Using the becquerel unit a more active (and so, all the other things fixed, more dangerous) source has a higher number. Using 1/s or s as a second instead may lead to confusion. DEFINITION 1 Bq = 1 s–1 SI MULTIPLES ORIGIN It was named after Henri Becquerel , who shared a Nobel Prize with Marie Curie for their work in discovering radioactivity. EXTERNAL LINKS
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