M. Járó - L. Költő szerk.: Archaeometrical research in Hungary (Budapest, 1988)

Dating - BENKŐ Lázár: Thermoluminescence dating of Hungarian archaeological sites (potteries, hearths, calcite)

The TL response can be written as R = 22 534t + 180 360 and in the case of R = 0 we have t = 8.004 min which is the equivalent of Q = 19.93 Gy (Fig. 5). By repeated measurements the following values were obtained: 19.93, 2030, 19.54, 21.13 Gy. Hence the mean value of Q is 2023 ±0.68 Gy. Time of irradiation /miu/ Fig. 5 Determination of the palaeodose (sample No.: 53.35.116.) Supralinearity interception (I). For low doses (up to about 3 Gy) the growth of TL with dose is supralinear. Therefore it is necessary to measure the second-glow growth characteristic obtained by portions which have been irradiated after drainage in the course of the first glow. The intercept value is to be added to the equivalent dose, so the palaeodose is P = 0 + I. It is assumed that there is no change in sensitivity between first and second glow (in fact, the slopes are more or less parallel). The value of intercept corresponding to Q = 1953 Gy is I =2.97 Gy (Fig.

5),therefore P = 19.93 + 2.97 =22.90 Gy. By averaging four similar measurements, I = 2.98 ±0.09 Gy andP = 23.20 ±0.71 Gy. The ratios of slopes (second growth per first growth) are 0.90, 0.92, 0.90, 0.89, respectively. Gamma dose-rate (D-y). Allowance needs to be made for attenuation due to the capsule wall and for the difference in energy response between CaS0

4 :Dy and the sample (quartz-like material). For the copper wall of 1 mm thickness, the dose absorbed by CaS0

4 :Dy is appr. 8% lower than the actual dose to quartz grains.