Datowanie ceramiki zabytkowej metodą termoluminescencji
DATING OF ANCIENT POTTERY WITH THE USE OF THERMOLUMINESCENCE
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Thermoluminescence is a phenomenon exhibited to varying degree by many minerals. It consists in the ability of emission of light within and above the range of ordinary red-hot glow when a substance called the luminophore is heated. The light represents here the released energy that has been stored in the form of electrons trapped in the c r y s ta l, lattice of the given mineral and is proportional to the total dose of radiation once received. In most pottery specimens mineral constituents (e.g. quartz) may be found possessing the property of accumulating thermoluminescence and also that of receiving small but significant doses of nuclear radiation coming from radioactive impurities in clay of which the pottery was made. Heating to temperatures above 500°C removes the accumulated thermoluminescence and consequently the firing of clay into pottery brings the luminescence dowTn to zero. However, after that the thermoluminescence grow’s in time. This grow is also dependant on the particular thermoluminescent constituents present in the given pottery fragments as well as upon the radiation dose- rate as explained above. As a result of laboratory measurements the thermoluminescence carried by pottery can be expressed as an equivalent radiation dose that is determined through exposing the pottery piece to radiation of an artificial radioisotope. Dating of ancient pottery with the use of thermoluminescence is at present under ex tensiv e development in many research centres and it is hoped that the improved techniques will greatly contribute to reduction of indistinctness and errors but it hardly seems that a method could ever be worked out giving the results with their accuracy exceeding that of ± 5 per cent. Another aspect of pottery dating is the detection of fakes.
- E. T. Hal l , Dating Pottery Ъу Thermoluminescence, „Science in Archeology”, Thames and Houdson 1965.
- S. J. F l emi n g , Thermoluminescent Dating: Refinement of the Quartz Inclusion Method, „Archeometry”, 12/2/1970, ss. 133—145.
- M. J. A i t k e n, Thermoluminescence, „Science Journal”, June 65, ss. 32—38;
- S. J. F l e mi n g , T h e rm o luminescent Age Studies, „Archeometry”, 12, 1970.
- Y. I c h i k a w a , Dating of Ancient Ceramics by Thermoluminescence, „Bulletin of the Institute for Chemical Research”, vol. 45, No 1, 1967.
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