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Abstract  

14C dating of 6 Japan cedars having the relative growing ages were made. On the basis of correlation analysis of our data to a14C age data set, INTCAL of CALIB (Stuiver), the growing ages of these Japan cedars were estimated (BC 1090-2375). The atmospheric14C concentration (Δ14C) at their growing ages were obtained from the14C age data. The variation of Δ14C shows basically the same pattern with that of Europe or America (r=0.783).

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Abstract  

Soil gas measurements of radon were made in St. Elizabeth, Jamaica using nuclear track etch detectors. The results were compared to gamma-ray spectroscopy measurements made in the laboratory on soil samples collected at the radon measurement sites. An assessment of the degree of disequilibrium of uranium and thorium was also made by comparison with neutron activation analysis, delayed neutron counting and equivalent uranium and thorium measurements. The results to date for equivalent uranium and radon show a strong correlation and indicate the possibility of soil radon mapping in Jamaica using gamma-ray spectroscopy. Three anomalous sites have been identified.

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presented in the Table 2 . In the case of overlapping exothermic effects, as for the 2.5Cu and 5Cu samples, it was impossible to obtain the values of reaction heat corresponding to individual peaks. The date for the 35Cu sample is not included in the table

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Date for reactive chemical substances . Safety Document of the Japan Research Institute of Industrial Safety , vol. RIIS-SD-87. 65. Hattori , K , Tanaka , Y , Suzuri , H , Ikawa

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