Thermoluminescence dating of the ancient Chinese porcelain using a regression method of saturation exponential in pre-dose technique

Weida, Wang; Xia, Jianghai

doi:10.1007/s11431-006-0194-3

Cited by 8 publications

(11 citation statements)

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“…Similarly, ΔS 2 =S N+2β −S N+β is a linear function of S N+β , the rest may be deduced by analogy, as shown in ref. [12]. To do this, one makes a linear regression plot for the data pairs (ΔS 1 , S N ) and (ΔS 2 , S N+β ), and obtains the intercept a and the gradient b from the linear function.…”

Section: Paleodose Measurement By the Activation Methodsmentioning

confidence: 99%

“…(1) see ref. [12]. The paleodose measured by the activation method is illustrated with the following example.…”

Section: Paleodose Measurement By the Activation Methodsmentioning

confidence: 99%

“…In fact, this assumption is correct only when the dose is within the range of a few Gy. Saturation of sensitization of the 110℃ TL peak in quartz and its potential application in the pre-dose technique have been studied for decades [4][5][6][7][8][9][10][11] and a regression method of saturation exponential according to a function relation of the thermal activation and the radiation quenching sensitivities to radiated dose has been reported [12] .…”

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Thermal activation and radiation quenching characteristics and their application to the pre-dose dating of porcelain

Weida

2009

Sci. China Ser. E-Technol. Sci.

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The pre-dose technique is important for thermoluminescence (TL) dating of porcelain. The principle of pre-dose dating is based on two characteristics: thermal activation and radiation quenching of the porcelain. Based on these principles, two measurement methods, "the activation method" and "the quenching method", respectively, have been developed for evaluation of the porcelain paleodose. The paleodose values obtained are the same for the ages in the range of 100-1000 a BP for porcelains measured by these two methods. But for dating at lower age limits (less than 100 a BP), the activation method is more accurate; conversely, at higher age limits (greater than 1000 a BP) the quenching method is more accurate. In addition, two specific calculating methods are described for a few porcelains having anomalous activation and quenching characteristics that make these two methods invalid.porcelain, thermoluminescence dating, pre-dose technique, thermal activation, radiation quenchingThe pre-dose technique is very useful for thermoluminescence (TL) dating of porcelain. If a porcelain sample is rapidly heated to a high temperature, the 110℃ TL sensitivity of the previously absorbed dose (i.e. the cumulative dose resulting from natural radiation throughout the history of the specimen and that from the laboratory calibrating dose) will rise rapidly up to a maximum (saturation) value; this phenomenon is called "the thermal activation characteristic". In addition, after a sample receives an irradiating dose, the 110℃ TL sensitivity not only does not rise, but, on the contrary, falls to a level lower than before irradiation. This is called "the radiation quenching characteristic". Pre-dose dating is based simply on the thermal activation and the radiation quenching.The pre-dose effect is present mainly at 110℃ TL peak in quartz. Its "memory effect" can be used for evaluation of paleodose, as was realized by Fleming in 1969 [1] . Its use as a new dating method was suggested by Fleming in 1973 [2] . The pre-dose technique is used mainly for dating of young samples and for accidental dosimetry. Its range of application is not wide because of the characteristics of the pre-dose. The activation methodThe mechanism of thermal activation for the 110ºC TL peak in quartz can be explained as the TL sensitivity change is from the probability increment of the holes recombined by the electrons in the activated luminescence centre L. For details, see the energy-level model for the pre-dose effect of the 110℃ TL peak in quartz suggested by Zimmerman [3] , Chen [4] and Aitken [5] .

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Section: Paleodose Measurement By the Activation Methodsmentioning

confidence: 99%

“…(1) see ref. [12]. The paleodose measured by the activation method is illustrated with the following example.…”

Section: Paleodose Measurement By the Activation Methodsmentioning

confidence: 99%

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Thermal activation and radiation quenching characteristics and their application to the pre-dose dating of porcelain

Weida

2009

Sci. China Ser. E-Technol. Sci.

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“…The thermoluminescence dating of ancient porcelain using the regression method of saturation exponential in the pre-dose technique has been reported [1] . The key to successful application of TL dating is to determine the paleodose of the ceramic as accurately as possible.…”

Section: The Sources and Components Of Paleodose In Porcelainmentioning

confidence: 99%

“…In ref. [1] we obtained an average annual dose D = 4.9±0.85(17%, ±1σ) mGy/a for the ancient Chinese porcelain, in which the annual environment dose is D γ+C = 1 mGy/a, accounting for about 20% of the D, and the annual beta dose D β = 3.9 mGy/a, accounting for about 80% of the D. Hence in the pre-dose dating the paleodose is mainly from the internal β radiation in the porcelain body, the external environment radiation from the earth's surface and outer space are less important. The storage environment of a certain porcelain is unknown, so a typical value is chosen for the annual environmental dose D γ+C from γ radiation plus cosmic ray.…”

Section: The Sources and Components Of Paleodose In Porcelainmentioning

confidence: 99%

Evaluation for the paleodose in thermoluminescence dating of porcelain

Weida

2008

Sci. China Ser. E-Technol. Sci.

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Sources, components and calibration of paleodose were studied for proper evaluation of the paleodose of porcelain in thermoluminescence (TL) dating. In the TL dating of porcelain using the pre-dose technique, the β dose from the internal natural radiation in the body of porcelain is the first, the environmental dose the second, and the α dose negligible. Sample thickness of 0.2-0.5 mm was used in the paleodose calibration. For a porcelain sample of such thickness, the distribution of β dose inside the sample was nonlinear when the sample (aluminium replaces porcelain in this experiment) was irradiated by a laboratory 90 Sr-90 Y β source. Therefore, the β dose used was only an average value. A distribution curve of β dose and the calculation of average β dose in the sample were obtained, according to the build-up and attenuation effects of β dose in the sample. The results showed that a sample thickness of 200 μm resulted in an average dose increment of about 4% compared to the surface whereas for a sample with a thickness of 400 μm, the average dose reduced by the same percentage, and that for a sample of 300 μm in thickness the average dose is equal to surface dose approximately. The average β dose in samples with various thickness can be obtained by the provided equations. thermoluminescence dating, porcelain, paleodose, build-up, attenuation, average beta dose The sources and components of paleodose in porcelainThe thermoluminescence dating of ancient porcelain using the regression method of saturation exponential in the pre-dose technique has been reported [1] . The key to successful application of TL dating is to determine the paleodose of the ceramic as accurately as possible. Sources, components, and calibration of paleodose in the ceramic are important in this case. The sources and components of paleodose are very different, which depend on the method, sample and grain size or thickness of the sample. These issues must be thrashed out; or the TL age obtained will be wrong or confounded.

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