In Christian theology Judas Iscariot betrayed Jesus for 30 pieces of silver. What type of coin might that have been?

by AccFan

My precursory research shows that the Roman Emperor at the time was Tiberius (14-37 AD). I have very little knowledge of the Roman Denarius - would previous emperor's versions still be in circulation? Would there be other silver coins in circulation besides the denarius?

Thanks in advance

crrpit

For more detail on this than you might reasonably expect, please see this older post from u/Celebreth