Carbon from the Dead Sea Scrolls, very old manuscripts found in Israel, gave 12.1 disintegrations of 14C

Question:

Carbon from the Dead Sea Scrolls, very old manuscripts found in Israel, gave 12.1 disintegrations of 14C per minute per gram of carbon. How old are the manuscripts? Carbon from living material gives 15.3 disintegrations of 14C per minute per gram of carbon.