Luminescence (version 0.3.1)

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

Description

Collection of data from various sources needed for cosmic dose rate calculation

Usage

BaseDataSet.CosmicDoseRate

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

$$Dc = D0*(F+J*exp((altitude/1000)/H))$$

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

ll{

Program: "AGE" Reference: Gruen (2009) Fit: Polynomials in the form of

}

$$y = 2*10^-6*x^2-0.0008*x+0.2535 (for depths between 40-167 g cm^-2)$$

$$y = 2*10^-6*x^2-0.0008*x+0.2535 (For depths <40 g="" cm^-2)$$="" <="" p="">

values.factor.Altitude

ll{

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

ll{

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.):

$$y = 0.0002*x + 4.0914$$

Version

0.1

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)