Collection of data from various sources needed for cosmic dose rate
calculation
Format
values.cosmic.Softcomp:
data frame containing cosmic dose rates
for shallow depths (< 167 g cm^-2) obtained using the "AGE" program by
Rainer Gruen (cf. Gruen 2009). These data essentially reproduce the graph
shown in Fig. 1 of Prescott & Hutton (1988).
values.factor.Altitude:
data frame containing altitude factors
for adjusting geomagnetic field-change factors. Values were read from Fig. 1
in Prescott & Hutton (1994).
values.par.FJH:
data frame containing values for parameters F, J
and H (read from Fig. 2 in Prescott & Hutton 1994) used in the expression
Dc = D0*(F+J*exp((altitude/1000)/H))
Version
0.1
Source
The following data were carefully read from figures in mentioned
sources and used for fitting procedures. The derived expressions are used in
the function calc_CosmicDoseRate.
values.cosmic.Softcomp
Program:
"AGE"
Reference:
Gruen (2009)
Fit:
Polynomials in the form of
For depths between 40-167 g cm^-2:
y = 2*10^-6*x^2-0.0008*x+0.2535
(For depths <40 g cm^-2)
y = -6*10^-8*x^3+2*10^-5*x^2-0.0025*x+0.2969
values.factor.Altitude
Reference:
Prescott & Hutton (1994)
Page:
499
Figure:
1
Fit:
2-degree polynomial in the form of
y = -0.026*x^2 + 0.6628*x + 1.0435
values.par.FJH
Reference:
Prescott & Hutton (1994)
Page:
500
Figure:
2
Fits:
3-degree polynomials and linear fits
F (non-linear part, λ < 36.5 deg.):
y = -7*10^-7*x^3-8*10^-5*x^2-0.0009*x+0.3988
F (linear part, λ > 36.5 deg.):
y = -0.0001*x + 0.2347
J (non-linear part, λ < 34 deg.):
y = 5*10^-6*x^3-5*10^-5*x^2+0.0026*x+0.5177
J (linear part, λ > 34 deg.):
y = 0.0005*x + 0.7388
H (non-linear part, λ < 36 deg.):
y = -3*10^-6*x^3-5*10^-5*x^2-0.0031*x+4.398
H (linear part, λ > 36 deg.):
y = 0.0002*x + 4.0914
References
Gruen, R., 2009. The "AGE" program for the calculation of luminescence age estimates.
Ancient TL, 27, pp. 45-46.
Prescott, J.R., Hutton, J.T., 1988. Cosmic ray and gamma ray dosimetry for
TL and ESR. Nuclear Tracks and Radiation Measurements, 14, pp. 223-227.
Prescott, J.R., Hutton, J.T., 1994. Cosmic ray contributions to dose rates
for luminescence and ESR dating: large depths and long-term time variations.
Radiation Measurements, 23, pp. 497-500.
Examples
##load data
data(BaseDataSet.CosmicDoseRate)
Results
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> library(Luminescence)
Welcome to the R package Luminescence version 0.6.0 [Built: 2016-05-30 16:47:30 UTC]
The undecided OSL component: 'Should I stay or should I go?'
> png(filename="/home/ddbj/snapshot/RGM3/R_CC/result/Luminescence/BaseDataSet.CosmicDoseRate.Rd_%03d_medium.png", width=480, height=480)
> ### Name: BaseDataSet.CosmicDoseRate
> ### Title: Base data set for cosmic dose rate calculation
> ### Aliases: BaseDataSet.CosmicDoseRate
> ### Keywords: datasets
>
> ### ** Examples
>
>
> ##load data
> data(BaseDataSet.CosmicDoseRate)
>
>
>
>
>
> dev.off()
null device
1
>