Why is Neon not used as a coolant for gas cooled nuclear reactors?

What is the reason that Neon is not considered as good coolant for gas cooled reactors? I haven’t found any research nor experiment with Neon in this field. As I checked out Neon has small neutron cross section area and is chemically inert. The next two isotopes are stable and the closest unstable isotope has a half life of 37s (don’t know if it is considered high or low).
The thermal conductivity and thermal capacity is similar to Carbon dioxide which is considered as a good coolant for gas cooled reactors.

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