Most modern-date values are reported against 100. If it is against 1 instead, use 1 here.
decimals
Amount of decimals required for the pMC value.
Value
pMC values from C14 ages.
Details
Post-bomb dates are often reported as pMC or percent modern carbon. Since Bacon expects radiocarbon ages,
this function can be used to calculate pMC values from radiocarbon ages. The reverse function of pMC.age.