rice (version 1.3.0)

FtoC: Calculate C14 ages from F14C values.

Description

Calculate C14 ages from F14C values of radiocarbon dates. Shorthand for the function F14CtoC14.

Usage

FtoC(F14C, er = NULL, roundby = NA, lambda = 8033, botherrors = FALSE)

Value

The radiocarbon ages from the F14C values. If F14C values are above 100%, the resulting radiocarbon ages will be negative.

Arguments

F14C

Reported mean of the F14C

er

Reported error of the F14C. Returns just the mean if left empty.

roundby

Amount of decimals required for the output. Defaults to roundby=NA, no rounding.

lambda

The mean-life of radiocarbon (based on Libby half-life of 5568 years).

botherrors

Since going from C14 to F14C involves a logarithmic transformation (F=exp(-y/lambda)), errors that are symmetric on the C14 scale will become asymmetric on the F14C scale. By default, only the largest error is reported, but if reportbotherrors=TRUE, both errors are reported. #' @return The radiocarbon ages from the F14C values. If F14C values are above 100%, the resulting radiocarbon ages will be negative.

Details

Post-bomb dates are often reported as F14C (between 0 at c. 55 kcal BP and 1 at c. AD 1950). Since software such as Bacon expects radiocarbon ages, this function can be used to calculate radiocarbon ages from F14C values. The reverse function is age.F14C.

Examples

  FtoC(1.10, 0.005) # a postbomb date, so with a negative C14 age
  FtoC(.80, 0.005) # prebomb dates can also be calculated