In an earlier section we mentioned that the limit of the technique is about 55-60 000 years.
Obviously, the limit of the method differs between laboratories dependent upon the extent to which background levels of radioactivity can be reduced.
D., a psychologist and author of “While there are always exceptions to rules, a good rule to remember is that dating someone more than 10 years older will present challenges now or later that add to the preexisting challenges any relationship has,” he says.
Couples with a big age difference need to think things through or risk finding themselves at conflicting stages in their relationship, adds relationship specialist Rachel Sussman.“You can see varied cultural references, disapproval from family and friends, and perhaps community disapproval, as well,” she says.
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.
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.
It is vital for a radiocarbon laboratory to know the contribution to routine sample activity of non-sample radioactivity.
Both experts agree than more than 10 years’ difference in a relationship can come with foreseeable issues, but that doesn’t mean it’s a definite nonstarter.
A week later, somewhere between one and four glasses of wine, he told me I looked “quite young” and asked how old I was.“I’m 25,” I said, trying to seem proud of the number even though I’d just celebrated this birthday with a bit of dread about growing up.
He nodded in surprise and didn’t offer his age until I asked for it. Then he excused himself to the go to the bathroom while I sat wondering what this number meant: Would he want to move faster in a relationship? Would he be appalled by my tiny studio apartment, which I could barely afford?
He was closer to 40 than I was to 30, and I felt like he’d inevitably want marriage and children much sooner than I would.
So I let our connection slip away, allowing my concern over our age difference to overshadow our passion.
A copy of this paper may be found in the Radiocarbon Home Page The radiocarbon age of a sample is obtained by measurement of the residual radioactivity. T (National Institute of Standards and Technology; Gaithersburg, Maryland, USA) Oxalic Acid I (C). The activity of 1890 wood is corrected for radioactive decay to 1950.