Ninety-five percent of the activity of Oxalic Acid from the year 1950 is equal to the measured activity of the absolute radiocarbon standard which is 1890 wood.
This is the International Radiocarbon Dating Standard.
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.
The ratio of the activity of sucrose with 0.95 Ox was first measured by Polach at 1.50070.0052 (Polach, 1976b:122).
Later inter-laboratory measurements put the ratio at 1.5081 (Currie and Polach, 1980).
According to Stuiver and Polach (1977), all laboratories should report their results either directly related to NBS Oxalic acid or indirectly using a sub-standard which is related to it.
To cater to religious diversity, the abbreviations BCE (Before Common Era) and CE (Common Era) can be used to replace BC and AD.
Of note, AD is written before the year, while BC, BCE, and CE are written after the year.
The derivation is based on very simple arithmetic so should not be hard to understand. So, here is a graphic to illustrate the calculation. But this is a standard number line which has a zero. As you can plainly see, counting forward 10 years from 5 BC on the BC - AD time scale takes you to 6 AD.Ordinary numbers can be calculated using a number line (for counting purposes) which has a zero, but for the BC and AD date system, there is no zero year between BC and AD. So, the formula for computing dates from BC forward past the BC-AD border is to do the following: This converts the numbers computed using the number line, which has a zero, to a BC-AD time scale, which does not have a zero.But remember this is for adding years to a BC date that will result in an AD year.The supporters of the latter only instigated the use of ‘Common Era’ to refer to the Vulgar Years, or the years after Christ’s birth.BCE, along with CE, were said to have been developed so as not to be connoted purely on Christian origins. BC means before Christ, whereas BCE means before the Common Era. You agree that we have no liability for any damages.