calc_CobbleDoseRate function

Calculate dose rate of slices in a spherical cobble

Calculates the dose rate profile through the cobble based on Riedesel and Autzen (2020).

Corrects the beta dose rate in the cobble for the grain size following results of Guérin et al. (2012). Sediment beta and gamma dose rates are corrected for the water content of the sediment using the correction factors of Aitken (1985). Water content in the cobble is assumed to be 0.

calc_CobbleDoseRate(input, conversion = "Guerinetal2011")

Arguments

• input: data.frame (required ): A table containing all relevant information for each individual layer. For the table layout see details.
• conversion: character (with default): dose rate conversion factors to use, see BaseDataSet.ConversionFactors for the accepted values.

Returns

The function returns an RLum.Results object for which the first element is a matrix (DataIndividual) that gives the dose rate results for each slice for each decay chain individually, for both, the cobble dose rate and the sediment dose rate. The second element is also a matrix (DataComponent) that gives the total beta and gamma-dose rates for the cobble and the adjacent sediment for each slice of the cobble.

Details

The input table layout

COLUMN	DATA TYPE	DESCRIPTION
Distance	numeric	distance from the surface of the cobble to the top of each rock slice in mm. The distance for each slice will be listed in this column
DistanceError	numeric	Error on the distance in mm
Thickness	numeric	Thickness of each slice in mm
TicknessError	numeric	uncertainty of the thickness in mm.
Mineral	character	'FS' for feldspar, 'Q' for quartz, depending which mineral in the cobble is used for dating
Cobble_K	numeric	K nuclide content in % of the bulk cobble
Cobble_K_SE	numeric	error on K nuclide content in % of the bulk cobble
Cobble_Th	numeric	Th nuclide content in ppm of the bulk cobble
Cobble_Th_SE	numeric	error on Th nuclide content in ppm of the bulk cobble
Cobble_U	numeric	U nuclide content in ppm of the bulk cobble
CobbleU_SE	numeric	error on U nuclide content in ppm of the bulk cobble
GrainSize	numeric	average grain size in µm of the grains used for dating
Density	numeric	Density of the cobble. Default is 2.7 g cm^-3
CobbleDiameter	numeric	Diameter of the cobble in cm.
Sed_K	numeric	K nuclide content in % of the sediment matrix
Sed_K_SE	numeric	error on K nuclide content in % of the sediment matrix
Sed_Th	numeric	Th nuclide content in ppm of the sediment matrix
Sed_Th_SE	numeric	error on Th nuclide content in ppm of the sediment matrix
Sed_U	numeric	U nuclide content in ppm of the sediment matrix
Sed_U_SE	numeric	error on U nuclide content in ppm of the sediment matrix
GrainSize	numeric	average grain size of the sediment matrix
WaterContent	numeric	mean water content of the sediment matrix in %
WaterContent_SE	numeric	relative error on water content

Water content

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

$$(Wet\_weight - Dry\_weight) / Dry\_weight * 100$$

Function version

0.1.0

Examples

## load example data
data("ExampleData.CobbleData", envir = environment())

## run function
calc_CobbleDoseRate(ExampleData.CobbleData)

How to cite

Riedesel, S., Autzen, M., 2025. calc_CobbleDoseRate(): Calculate dose rate of slices in a spherical cobble. 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., Colombo, M., Steinbuch, L., Boer, A.d., 2025. Luminescence: Comprehensive Luminescence Dating Data Analysis. R package version 1.0.1. https://r-lum.github.io/Luminescence/

References

Riedesel, S., Autzen, M., 2020. Beta and gamma dose rate attenuation in rocks and sediment. Radiation Measurements 133, 106295.

See Also

convert_Concentration2DoseRate

Author(s)

Svenja Riedesel, Aberystwyth University (United Kingdom)

Martin Autzen, DTU NUTECH Center for Nuclear Technologies (Denmark) , RLum Developer Team