Carbon dating!!!!! A 5g charcoal sample from an ancient fire pit has a 14C activity of 63 disintegrations per minute. A living tree has a 14C activity of 15 disintegrations per minute per 1g. The half-life of 14C is 5730 years. How old is the charcoal sample from the ancient fire pit? 2. Relevant equations dont think that any are necessary (I think!!) 3. The attempt at a solution 63/5 =12.6 12.6/15 = 0.84 5730*0.84 = 4813.2 years This isnt the right answer im sure. This is taken from a previous exam paper im doing to revise for my exams, and carbon dating is defintly gona come up, but cant find a method for doing this kind of question any where can somone pleeease help!!!