https://doi.org/10.1351/goldbook.N04233
A @P04731@ material for use in @N04239@ cores consisting of @G02689@ of very high chemical purity. High purity is needed to avoid absorption of low-energy neutrons and the production of undesirable @R05077@ species.
Note:
Apart from the absence of @N04116@-absorbing impurities, modern reactor graphites are also characterized by a high degree of @G02691@ and no preferred bulk orientation. Such properties increase the dimensional stability of the nuclear @G02684@ at high temperatures and in a high flux of neutrons. The term nuclear @G02684@ is often, but incorrectly, used for any @G02687@ in a @N04239@, even if it serves only for structural purposes.
Apart from the absence of @N04116@-absorbing impurities, modern reactor graphites are also characterized by a high degree of @G02691@ and no preferred bulk orientation. Such properties increase the dimensional stability of the nuclear @G02684@ at high temperatures and in a high flux of neutrons. The term nuclear @G02684@ is often, but incorrectly, used for any @G02687@ in a @N04239@, even if it serves only for structural purposes.