QQuestion
(a) (i) Which element is used in the lining of the special aprons worn by workers in nuclear power plants?
(ii) Why is this element preferred?
(b) 2411Na emits a nuclear radiation which does not alter the mass number but is deflected by a magnetic field.
- Name the type of nuclear radiation emitted by 2411Na.
- Write the equation for this radioactive decay.
✓Answer
(a) (i) Lead is used in the lining of the special aprons.
(ii) It is preferred because it is a dense metal and absorbs harmful nuclear radiations effectively.
(b) (1) The emitted radiation is beta (β) radiation.
(2) Radioactive decay equation:
{}^{24}_{11}\mathrm{Na}\longrightarrow{}^{24}_{12}\mathrm{Mg}+{}^{0}_{-1}\text{β}In beta decay, the atomic number increases by 1 while the mass number remains unchanged.
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