Becquerel's Concept of Radioactive Activity - Nuclear Physics - video Dailymotion

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The becquerel is the SI unit used to express the number of decays of an atomic nucleus per second.  Example of Radioactive Activity: A radioactive sample emits radiation at a rate of 4.8x10⁹ decays per year. What is the value of this radiation activity in becquerels?  #NuclearPhysics #Radioactivity

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00:00A radioactive sample emits radiation at a rate of 4.8 times 10 to the power of 9 disintegrations per year.

00:10The question is, what is the value of this radiation activity in becquerels?

00:17Okay, here's a radioactive sample.

00:21This sample consists of several atoms that share the same atomic nucleus.

00:25Atomic nuclei can decay into other atomic nuclei by emitting radioactive rays.

00:34This is what is meant by nuclear activity.

00:38The SI unit for nuclear activity is the becquerel.

00:42One becquerel, written as 1bq, is one disintegration per second.

00:47Here is an animation of the radiation activity of 1 becquerel, 2 becquerels, and 3 becquerels.

00:58The first step is identification.

01:15The nuclear activity, A, is equal to 4.8 times 10 to the power of 9 disintegrations per year.

01:22In BQ units, disintegration per year must be converted to disintegration per second.

01:30There are 366 days in a year, 24 hours in a day, and 3600 seconds in an hour.

01:40So, one year is equal to 366 times 24 times 3600.

01:46The result is 3.16 times 10 to the power of 7 seconds.

01:55The nuclear activity in BQ units,

01:58R is equal to 4.8 times 10 to the power of 9 disintegrations per year

02:03divided by 3.16 times 10 to the power of 7 seconds per year.

02:10A little calculation, 152 becquerels.

02:14This is the value of the nuclear activity of a radioactive sample in becquerel units.

02:24Hopefully this is useful, and don't forget to watch the next video.

Becquerel's Concept of Radioactive Activity - Nuclear Physics

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