~The year AD 1950 is taken as the present in all 14C dates.
~The value of the standard deviation (or statistical error) applied to 14C dates varies with different dates.
The ratio between 14C and 12C in a living organism thus remains constant.
~When a living organism dies, the absorption of 14C atoms ceases and a result of the abovementioned disintegration the 14C gradually decreases.
~Such a date can be expressed as follows: 1500 -150 Before Present (BP).
The standard deviation of -150 applied to the above mentioned date indicates that there is a 67% possibility that the correct date for the particular object (organism) falls between 13 Before Present.
Image Source Absolute dating provides specific dates or ranges of dates, in years.