'Half shekel' in the Bible

When the camels had finished drinking, the man took a gold ring weighing a half-shekel and two bracelets for her wrists weighing ten shekels in gold,

This they shall give, every one that passeth among them that are numbered, half a shekel after the shekel of the sanctuary: (a shekel is twenty gerahs:) an half shekel shall be the offering of the LORD.

the rich doth not multiply, and the poor doth not diminish from the half-shekel, to give the heave-offering of Jehovah, to make atonement for your souls.

a bekah per head, that is a half shekel, by the shekel of the sanctuary, for all that passed over to them who had been numbered, from twenty years old and upwards, for six hundred and three thousand, and five hundred and fifty.

And when they were come to Capernaum, they that received the half-shekel came to Peter, and said, Doth not your teacher pay the half-shekel?