What is a moderator? Name the material used as a moderator in a nuclear reactor.
(N/A) moderator is a substance used in a nuclear reactor to slow down the fast-moving neutrons produced during nuclear fission.
Fast neutrons are less likely to cause further fission in $U^{235}$ nuclei compared to thermal (slow) neutrons.
By colliding with the nuclei of the moderator material,the kinetic energy of the neutrons is reduced,making them 'thermal' neutrons.
Common materials used as moderators include heavy water $(D_2O)$,graphite,and ordinary water $(H_2O)$.
Fast neutrons are less likely to cause further fission in $U^{235}$ nuclei compared to thermal (slow) neutrons.
By colliding with the nuclei of the moderator material,the kinetic energy of the neutrons is reduced,making them 'thermal' neutrons.
Common materials used as moderators include heavy water $(D_2O)$,graphite,and ordinary water $(H_2O)$.
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Fission of nuclei is possible because the binding energy per nucleon in them
In the given nuclear reaction
${ }_{4}^{9} Be+{ }_{2}^{4} He \rightarrow{ }_{6}^{12} C+X$
$X$ represents $\qquad$
${ }_{4}^{9} Be+{ }_{2}^{4} He \rightarrow{ }_{6}^{12} C+X$
$X$ represents $\qquad$
Under certain circumstances,a nucleus can decay by emitting a particle more massive than an $\alpha$-particle. Consider the following decay processes:
$_{88}^{223} Ra \rightarrow _{82}^{209} Pb + _{6}^{14} C$
$_{88}^{223} Ra \rightarrow _{86}^{219} Rn + _{2}^{4} He$
Calculate the $Q$-values for these decays and determine that both are energetically allowed.
$_{88}^{223} Ra \rightarrow _{82}^{209} Pb + _{6}^{14} C$
$_{88}^{223} Ra \rightarrow _{86}^{219} Rn + _{2}^{4} He$
Calculate the $Q$-values for these decays and determine that both are energetically allowed.
Medium
View SolutionWhat is used as a moderator in a nuclear reactor?
Easy
View SolutionCalculate the power output of a ${}_{92}^{235}U$ reactor, if it takes $30 \, \text{days}$ to consume $2 \, \text{kg}$ of fuel, and if each fission releases $185 \, \text{MeV}$ of usable energy. (Given: Avogadro's number $= 6 \times 10^{23} \, \text{mol}^{-1}$) .......... $\text{MW}$ (in $.3$)
DifficultAIIMS 2007
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