Concerning the albite as one kind of feldspar, the far-RTL showed negligibly small fading rate within a few percentages, whereas the BTL gave up to 18% reduction after the storage for 7 months at room temperature. The results revealed that the far-RTL source would be stable and preferable for the TL dating in spite of intrinsically weak intensity, estimated in the detective limitation in a few Gy, equivalent to archaeological burnt feldspar constituents approximately 1 000 years ago. Finally, a

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... far-RTL emission mechanism was assigned to the participation of electric charge transfer on Fe2+ from Fe3+-impurity rather than the mechanism of energy transfer into Fe3+.