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Table 6 Acceptable results of the Tsunakawa–Shaw experiment

From: Archeointensity estimates of a tenth-century kiln: first application of the Tsunakawa–Shaw paleointensity method to archeological relics

Specimen NRM0 (A/m) MADN (°) ARM00 (A/m) MDFA0 (mT) LTD (%) First heating Second heating Hpast (μT)
SlopeA0 Slope N f N r N ΔAIC N SlopeA1 Slope T f T r T ΔAIC T
BH1J 1.21 0.8 0.394 35 2.1 0.989 1.07 0.959 0.998 37.2 1.03 1.01 1.01 1.00 8.43 53.3
BH2K 2.24 0.8 1.03 39 3.5 1.05 0.931 0.980 0.999 14.4 1.00 0.993 1.00 1.00 − 1.97 46.5
BH4N 0.541 1.1 0.281 36 2.6 1.00 0.938 0.970 1.00 − 0.81 0.997 0.998 0.999 1.00 − 0.21 46.9
BH6D 1.21 1.1 0.617 39 5.1 0.996 0.950 0.755 0.999 29.4 1.01 0.992 0.997 1.00 7.41 47.5
BH6E 1.09 1.1 0.631 41 2.4 1.03 0.857 0.914 0.999 38.3 1.00 0.979 0.938 0.999 − 1.83 42.8
BH7K 1.55 0.6 0.805 40 3.0 1.07 0.964 0.763 1.00 − 0.04 1.01 0.978 0.749 1.00 4.81 48.2
BH8L 3.54 0.6 1.60 42 2.2 1.19 1.01 0.859 0.996 33.1 0.993 1.02 0.995 1.00 1.48 50.3
BH8M 2.64 0.6 1.11 44 3.2 1.07 0.991 0.935 0.998 56.5 1.01 1.01 0.959 1.00 17.2 49.6
Average (Hpast) = 48.1 ± 3.1
  1. NRM0, the initial NRM intensity before LTD; MAD N , the maximum angler deviation of NRM; ARM00, the initial ARM0 intensity before LTD; MDFA0, the median destructive field of ARM0; LTD (%), the low-temperature demagnetized fraction of ARM0; SlopeA0, slopes of ARM spectra for coercivity in the ARM0–ARM1 diagrams; Slope N , slopes of the linear segments in the NRM-TRM1* diagrams; f N is the NRM fractions of the linear NRM-TRM1* segments; r N , correlation coefficients of the linear NRM-TRM1* segments; ΔAIC N , the AIC difference between the linear and quadratic fit of NRM-TRM1* diagrams; SlopeA1, slopes of ARM spectra for Hc in the ARM0–ARM1 diagrams; Slope T , slopes of the linear segments in the TRM1–TRM2* diagrams; f T , the TRM1 fractions of the linear TRM1–TRM2* segments; r T , correlation coefficients of the linear TRM1–TRM2* segments; ΔAIC T , the AIC difference between linear and quadratic fit of TRM1–TRM2* diagrams; H past , the estimated paleointensity