| Budget Amount *help |
¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 2006: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2005: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2004: ¥2,400,000 (Direct Cost: ¥2,400,000)
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| Research Abstract |
It is well known that an iron manufacturing technique in pre-modern is different in modern, but the detailed technique and the estimating of the place of production or of the supply place of feed materials have been not made clear. In this study, we analyzed excavated or produced iron productions (iron sand, iron ore, iron slag, iron lump, et al.) by some analytical methods. The first purpose of the study was the establishment of procedures for analytical methods to iron productions. The second purpose of the study was a discovery of an index for estimating of the place of the supply place of feed materials using of the analytical results. The third purpose of the study was the investigation of the iron manufacturing process. The analytical methods were used mainly a neutron activation analysis and an α spectrometry. The neutron activation analysis was used for the determination of multi elements and α spectrometry was used for the determination of uranium and thorium isotopes being ra
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dionuclides. The results of the study are described below.
1.In the α spectrometry, uranium and thorium isotopes in iron sand, iron ore, iron slag, iron lump and furnace clay were able to be dissolved, to be isolated separately by an ion-exchange chromatography and a co-precipitation method and to be measured. The radioactivities of ^<238>U, ^<234>U, ^<232>Th and ^<228> Th were accurately determined by this method.
2.As a result of the α spectrometry, we first found out the radioactive non-equilibrium between ^<234>U and ^<230>Th in iron ore and iron sand. However, the radioactive equilibrium in other samples had been established.
3.Radioactivities ratio ^<238>U to ^<232>Th were different from 4 iron manufacturing sites. This ratio may be index of the estimating of the supply place of feed materials.
4.In the activation analysis, trace elements in iron productions were able to be determined at several ppm level. The concentration ratio Ti to V in iron slag correlated closely with the ratio in iron sand. And the concentration ratio of As to Sb in iron lump correlated closely with the ratio in iron sand and iron ore. Less
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