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This comes about because of how rainbows are created.No matter where you are, the red line is 138 degrees from the sun and the purple line is 140 degrees from the Sun.Amongst accelerator laboratories there has been mooted the theoretical possibility of extended range dating to 75 000 yr , at present this seems difficult to attain because of the problems in accurately differentiating between ions that mimic the mass and charge characteristics of the C14 atom.
A time-independent level of C14 activity for the past is assumed in the measurement of a CRA.The next time you see a rainbow, draw an imaginary line from the sun through you.You’ll notice that this line goes exactly through the middle of the rainbow.The Oxalic acid standard which was developed is no longer commercially available. In the early 1980's, a group of 12 laboratories measured the ratios of the two standards.Another standard, Oxalic Acid II was prepared when stocks of HOx 1 began to dwindle. The ratio of the activity of Oxalic acid II to 1 is 1.29330.001 (the weighted mean) (Mann, 1983). There are other secondary radiocarbon standards, the most common is ANU (Australian National University) sucrose.
Obviously, this activity is additional and must be removed from calculations.