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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.