Abstract
Abstract Annealing of etchable fission tracks in apatite has been studied previously at temperatures between ∼200°C and 350°C and annealing times up to 2 years. Results have been used to extrapolate to geological times in order to obtain corrected fission track ages. On the other hand, extrapolation to higher temperatures (and short times) is needed in the interpretation of track fading in meteorites. In order to investigate the validity of this extrapolation, single isothermal annealing experiments have been made at annealing temperatures up to ∼500°C. It has been found that at these high annealing temperatures and short annealing times a serious experimental problem arises when using usual annealing procedures due to a delayed temperature increase in the sample. Results obtained (which prove the validity of the annealing law up to ∼500°C) and implications for further studies will be discussed.
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