" Answer: Carbon dating, or radiocarbon dating, like any other laboratory testing technique, can be extremely reliable, so long as all of the variables involved are controlled and understood.
Several factors affect radiocarbon test results, not all of which are easy to control objectively.
Nor can it tell if a much older spearhead was attached to a brand-new shaft.
Most archaeological items can’t be directly carbon dated, so their dating is based on testing done on nearby objects or materials.
This provides good information, but it only indicates how long ago that piece of wood was cut from a living tree.
This makes the results subject to the researchers’ assumptions about those objects.If the spear head is dated using animal bones nearby, the accuracy of the results is entirely dependent on the assumed link between the spear head and the animal.