native TL / sensitivity (TL/rad) | rad | |
age (yr) = | ----------------------------- = | --------- |
site dose rate (rad/yr) | (rad/yr) |
1 | ps g ld σ I φ | |
Age = | --- | ln[ 1 + ------------------------] |
LD | pi lf |
ps = native track density | d = total ^{238}U decay constant |
pi = induced track density | f = spontaneous fission ^{238}U |
φ = irradiation (neutrons cm^{-2}) | σ = cross-section area |
I = isotopic ratio ^{235}U/^{238}U | g = geometry factor |
LD = decay rate for ^{238}U (1.551 X 10^{-10} yr^{-1}) |