Cambridge University Natural Radiocarbon Measurements I

The dates given have been obtained up to the end of December, 1958. They have been made with carbon dioxide at 2 atmospheres pressure in a proportional counter of about 2-liter volume. For further details of construction and procedure, see Godwin, Walker, and Willis, 1957. The establishment of the project was made possible by a grant from the Trustees of the Nuffield Foundation, whom we are most happy to thank along with the Imperial Smelting Corporation who have lent us the zinc shielding for the gas-counter.