convert_Concentration2DoseRate: Dose-rate conversion function

In Luminescence: Comprehensive Luminescence Dating Data Analysis

Dose-rate conversion function

Description

This function converts radionuclide concentrations (K in %, Th and U in ppm) into dose rates (Gy/ka). Beta-dose rates are also attenuated for the grain size. Beta and gamma-dose rates are corrected for the water content. This function converts concentrations into dose rates (Gy/ka) and corrects for grain size attenuation and water content

Dose rate conversion factors can be chosen from Adamiec and Aitken (1998), Guerin et al. (2011), Liritzis et al. (201) and Cresswell et al. (2018). Default is Guerin et al. (2011).

Grain size correction for beta dose rates is achieved using the correction factors published by Guérin et al. (2012).

Water content correction is based on factors provided by Aitken (1985), with the factor for beta dose rate being 1.25 and for gamma 1.14.

Usage

convert_Concentration2DoseRate(input, conversion = "Guerinetal2011")

Arguments

input	data.frame (optional): a table containing all relevant information for each individual layer if nothing is provided, the function returns a template data.frame Please note that until one dataset per input is supported!
conversion	character (with default): which dose rate conversion factors to use, defaults uses Guérin et al. (2011). For accepted values see BaseDataSet.ConversionFactors

Details

The input data

COLUMN	DATA TYPE	DESCRIPTION
Mineral	character	'FS' for feldspar, 'Q' for quartz
K	numeric	K nuclide content in %
K_SE	numeric	error on K nuclide content in %
Th	numeric	Th nuclide content in ppm
Th_SE	numeric error on Th nuclide content in ppm
U	numeric U nuclide content in ppm
U_SE	numeric	error on U nuclide content in ppm
GrainSize	numeric	average grain size in µm
WaterContent	numeric	mean water content in %
WaterContent_SE	numeric	relative error on water content

Water content The water content provided by the user should be calculated according to:

(Wet_weight - Dry_weight) / Dry_weight * 100

The unit for the weight is gram (g).

Value

The function returns an RLum.Results object for which the first element is matrix with the converted values. If no input is provided, the function returns a template data.frame that can be used as input.

Function version

0.1.0

How to cite

Riedesel, S., Autzen, M., 2024. convert_Concentration2DoseRate(): Dose-rate conversion function. Function version 0.1.0. In: Kreutzer, S., Burow, C., Dietze, M., Fuchs, M.C., Schmidt, C., Fischer, M., Friedrich, J., Mercier, N., Philippe, A., Riedesel, S., Autzen, M., Mittelstrass, D., Gray, H.J., Galharret, J., 2024. Luminescence: Comprehensive Luminescence Dating Data Analysis. R package version 0.9.24. https://CRAN.R-project.org/package=Luminescence

Author(s)

Svenja Riedesel, Aberystwyth University (United Kingdom)
Martin Autzen, DTU NUTECH Center for Nuclear Technologies (Denmark) , RLum Developer Team

References

Adamiec, G., Aitken, M.J., 1998. Dose-rate conversion factors: update. Ancient TL 16, 37-46.

Cresswell., A.J., Carter, J., Sanderson, D.C.W., 2018. Dose rate conversion parameters: Assessment of nuclear data. Radiation Measurements 120, 195-201.

Guerin, G., Mercier, N., Adamiec, G., 2011. Dose-rate conversion factors: update. Ancient TL, 29, 5-8.

Guerin, G., Mercier, N., Nathan, R., Adamiec, G., Lefrais, Y., 2012. On the use of the infinite matrix assumption and associated concepts: A critical review. Radiation Measurements, 47, 778-785.

Liritzis, I., Stamoulis, K., Papachristodoulou, C., Ioannides, K., 2013. A re-evaluation of radiation dose-rate conversion factors. Mediterranean Archaeology and Archaeometry 13, 1-15.

Examples

## create input template
input <- convert_Concentration2DoseRate()

## fill input
input$Mineral <- "FS"
input$K <- 2.13
input$K_SE <- 0.07
input$Th <- 9.76
input$Th_SE <- 0.32
input$U <- 2.24
input$U_SE <- 0.12
input$GrainSize <- 200
input$WaterContent <- 30
input$WaterContent_SE <- 5

## convert
convert_Concentration2DoseRate(input)

Luminescence documentation built on June 22, 2024, 9:54 a.m.