Highly conductive, reflective and heat resistant material

[oror]

Which material or combination of materials is the most highly conductive(super-conductor) and highly reflective and heat resistant at the same time?
I am asking this because I am trying to block radiation.
T

 

[berkeman]

most highly conductive(super-conductor)

What is a typical temperature for a superconductor?

 

[Dr_Nate]

Which material or combination of materials is the most highly conductive(super-conductor) and highly reflective and heat resistant at the same time?
I am asking this because I am trying to block radiation.
T

If you say more about your setup then we could better focus our answers.

Metals are very highly conducting and when polished most are highly reflecting into the UV. Heat resistant isn't a great term. Perhaps you mean highest melting temperature. If that is so, then tungsten is a metal with a high melting temperature but it's reflectivity is not great. You can probably see how more information and numbers associated with physical quantities can help.

 

[Baluncore]

Iridium, atomic number 77.
https://en.wikipedia.org/wiki/Iridium