Question

Define one Curie.

Answer 1

Hint:Curie is basically used to measure the amount of radioactivity. This quantity is named in honour of French physicist Pierre Curie and his wife Madam Curie. Curie is described as a certain quantity of radioactive decays per second that quantity is equal to decay of 1 gram of radium per second.

Complete step by step answer:
Radioactivity basically refers to the particles which are emitted from nuclei as a result of nuclear instability. The unit for measuring the amount of radioactivity was the curie $$\left(Ci\right)$$. Initially, correspond to one gram of $$radium-226$$. Recently defined as $$1curie=3.7\times {10}^{10}$$ radioactive decays per second.
And which is roughly the amount of decays that occur in 1 gram of radium per second and is $$3.7\times {10}^{10}$$ becquerels $$\left(Bq\right)$$.
The typical human body contains roughly $$0.1\mu Ci\left(14mg\right)$$ of naturally occurring $$potassium-40$$. A human body containing $$16kg$$ of carbon would also have about $$24$$ nanograms or $$0.1\mu Ci$$ of $$carbon-14$$. Together, these would result in a total of approximately $$0.2\mu Ci$$ or $$7400$$ decays per second inside the person's body (mostly from beta decay but some from gamma decay).

Note:
Power:
The power emitted in radioactive decay corresponding to one curie can be calculated by multiplying the decay energy by approximately $$5.93mW/MeV.$$
SI units:
The SI unit of radioactivity is becquerel $$\left(Bq\right)$$ and this term has been kept after Henri Becquerel. It is defined as: The activity of a quantity of radioactive material where one decay takes place per second.
Some measuring quantities:
$$1curie=3.7\times {10}^{10}$$ radioactive decays per second
1 becquerel = 1 radioactive decay per second $$=2.703\times {10}^{-11}Ci.$$
$$1rutherford=1.106$$ radionuclide decays per second