By measuring the local susceptibility chi(loc)(T) of Ce-140 using TDPAC met
hod, we have studied magnetism and valence fluctuation behaviour of Ce in t
he quaternary borocarbide system CeNi2B2C. The magnitude of the measured ch
i(loc) along with the observed temperature dependence indicates non-integra
l valence of Ce ions. As a new feature, the average valence of Ce derived f
rom our chi(loc) data shows large variation with temperature.