Also, archaeologists cannot use their hands to touch the samples or smoke near them.
They risk seriously altering the result of the test.
While an uncalibrated reading may be off by a factor of 10%-20%, calibration severely reduces that value.
Standard calibration curves are now used for more accurate readings.
However, the quantity of Carbon-14 was nearly doubled in the ’50s and ’60s because of the atomic bomb testings in those decades.