analyse_SAR.TL: Analyse SAR TL measurements

In R-Lum/Luminescence: Comprehensive Luminescence Dating Data Analysis

Analyse SAR TL measurements

Description

The function performs a SAR TL analysis on a RLum.Analysis object including growth curve fitting.

Usage

analyse_SAR.TL(
  object,
  object.background,
  signal.integral.min,
  signal.integral.max,
  integral_input = "channel",
  sequence.structure = c("PREHEAT", "SIGNAL", "BACKGROUND"),
  rejection.criteria = list(recycling.ratio = 10, recuperation.rate = 10),
  dose.points,
  log = "",
  ...
)

Arguments

object	RLum.Analysis or a list of such objects (required) : input object containing data for analysis
object.background	currently not used
signal.integral.min	integer (required): requires the channel number for the lower signal integral bound (e.g. signal.integral.min = 100)
signal.integral.max	integer (required): requires the channel number for the upper signal integral bound (e.g. signal.integral.max = 200)
integral_input	character (with default): defines the input for the arguments signal.integral.min and signal.integral.max. These limits can be either provided 'channel' number (the default) or 'temperature'. If 'temperature' is chosen, the best matching channel is selected.
sequence.structure	vector character (with default): specifies the general sequence structure. Three steps are allowed ("PREHEAT", "SIGNAL", "BACKGROUND"), in addition a parameter "EXCLUDE". This allows excluding TL curves which are not relevant for the protocol analysis. (Note: No TL are removed by default)
rejection.criteria	list (with default): list containing rejection criteria in percentage for the calculation.
dose.points	numeric (optional): option set dose points manually
log	character (with default): a character string which contains "x" if the x-axis is to be logarithmic, "y" if the y axis is to be logarithmic and "xy" or "yx" if both axes are to be logarithmic. See plot.default).
...	further arguments that will be passed to the function fit_DoseResponseCurve

Details

This function performs a SAR TL analysis on a set of curves. The SAR procedure in general is given by Murray and Wintle (2000). For the calculation of the Lx/Tx value the function calc_TLLxTxRatio is used.

Provided rejection criteria

⁠[recycling.ratio]⁠: calculated for every repeated regeneration dose point.

⁠[recuperation.rate]⁠: recuperation rate calculated by comparing the Lx/Tx values of the zero regeneration point with the Ln/Tn value (the Lx/Tx ratio of the natural signal). For methodological background see Aitken and Smith (1988)

Value

A plot (optional) and an RLum.Results object is returned containing the following elements:

De.values	data.frame containing De-values and further parameters
LnLxTnTx.values	data.frame of all calculated Lx/Tx values including signal, background counts and the dose points.
rejection.criteria	data.frame with values that might by used as rejection criteria. NA is produced if no R0 dose point exists.

The output should be accessed using the function get_RLum.

Function version

0.3.0

Note

THIS IS A BETA VERSION

None TL curves will be removed from the input object without further warning.

Author(s)

Sebastian Kreutzer, Institute of Geography, Heidelberg University (Germany)

References

Aitken, M.J. and Smith, B.W., 1988. Optical dating: recuperation after bleaching. Quaternary Science Reviews 7, 387-393.

Murray, A.S. and Wintle, A.G., 2000. Luminescence dating of quartz using an improved single-aliquot regenerative-dose protocol. Radiation Measurements 32, 57-73.

See Also

calc_TLLxTxRatio, fit_DoseResponseCurve, RLum.Analysis, RLum.Results, get_RLum

Examples

##load data
data(ExampleData.BINfileData, envir = environment())

##transform the values from the first position in a RLum.Analysis object
object <- Risoe.BINfileData2RLum.Analysis(TL.SAR.Data, pos=3)

##perform analysis
analyse_SAR.TL(
 object = object,
 signal.integral.min = 210,
 signal.integral.max = 220,
 fit.method = "EXP OR LIN",
 sequence.structure = c("SIGNAL", "BACKGROUND"))

R-Lum/Luminescence documentation built on March 1, 2025, 12:43 a.m.