BaseDataSet.CosmicDoseRate: Base data set for cosmic dose rate calculation

BaseDataSet.CosmicDoseRateR Documentation

Base data set for cosmic dose rate calculation

Description

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, \lambda < 36.5 deg.):

y = -7*10^-7*x^3-8*10^-5*x^2-0.0009*x+0.3988

F (linear part, \lambda > 36.5 deg.):

y = -0.0001*x + 0.2347

J (non-linear part, \lambda < 34 deg.):

y = 5*10^-6*x^3-5*10^-5*x^2+0.0026*x+0.5177

J (linear part, \lambda > 34 deg.):

y = 0.0005*x + 0.7388

H (non-linear part, \lambda < 36 deg.):

y = -3*10^-6*x^3-5*10^-5*x^2-0.0031*x+4.398

H (linear part, \lambda > 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)


R-Lum/Luminescence documentation built on March 2, 2024, 12:39 p.m.