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Polonium -210 is pollutant emitted from...

Polonium -210 is pollutant emitted from

A

Laboratory radio-isotopes

B

Coolant water of reactors

C

Automobile exhausts

D

Thorium rich sands.

Text Solution

Verified by Experts

The correct Answer is:
B
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Polonium ( _84^210 Po ) emits _2^4He particles and is converted into lead ( _82^206Pb ). This reaction is used for producing electric power in a space mission. Po^210 has half-life of 138.6 days. Assuming an efficiency of 10% for the thermoelectric machine, how much ^210Po is required to produce 1.2xx10^7J of electric energy per day at the end of 693 days. Also find the initial activity of the material. Given : Masses of nuclei ^210Po=209.98264 amu, ^206Pb=205.97440 amu, _2^4He=4.00260 amu, 1 am u=931 MeV//c^2 and Avogadro's number = 6xx10^23//mol