| 摘要 |
PURPOSE:To improve the accuracy of measurement by putting a nuclear fuel oxide together with a metallic flux into a graphite crucible and melting the same by heating in a reducing atmosphere of an inert gas such as argon or helium thereby forming oxygen. CONSTITUTION:A mixture composed of the nuclear fuel oxide, for example, uranium dioxide and the metallic flux, for example, iron powder, is put into the graphite crucible 2. The inert gas such as argon is introduced into a gas extracting furnace 1. The mixture in the crucible 2 is melted by heating in the argon atmosphere. The oxygen is formed by the reduction reaction effected from the melting of the oxide and the metallic flux. The oxygen reacts with the carbon of the crucible 2 to form carbon monoxide because of the reducing atmosphere. The carbon monoxide is conducted together with the argon from the furnace 1 through a dust filter 7 to a carbon monoxide measuring instrument 3 by which the carbon monoxide in the argon is exactly quantitatively measured. The measured value is recorded in a recorder 4. The total quantity of the oxygen in the nuclear fuel oxide is thus extracted and since the direct measurement is possible, the accuracy of the measurement is improved.
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