A COMPARISON OF THE X-RAY AND OPTICAL METHODS OF DETERMINING THE GRAIN SIZE OF URANIUM
TL;DRAbstract
Earlier work on the determination of the grain size of uranium gave consistently lower values by X-ray back reflection methods than by optical examination. The present experiments show that this discrepancy exists even when the absorption and twinning effects are allowed for in re-crystallised uranium and gold and X-ray grain size values as low as a third of the optical grain size are obtained. Some, at least, of the discrepancy is due to preferred orientation in the material. The average X-ray grain size of cast uranium was found to be about 10 {mu}; X-ray micrographs showed no unit in the structure larger than about 75 {mu} with an average size of about 25 {mu}. The average optical grain size was about 50 {mu} suggesting that in case uranium the grains are composed of subgrains, the dis-orientation between some of these being too small to be determined optically. (auth)
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Earlier work on the determination of the grain size of uranium gave consistently lower values by X-ray back reflection methods than by optical examination. The present experiments show that this discrepancy exists even when the absorption and twinning effects are allowed for in re-crystallised uranium and gold and X-ray grain size values as low as a third of the optical grain size are obtained. Some, at least, of the discrepancy is due to preferred orientation in the material. The average X-ray grain size of cast uranium was found to be about 10 {mu}; X-ray micrographs showed no unit in the structure larger than about 75 {mu} with an average size of about 25 {mu}. The average optical grain size was about 50 {mu} suggesting that in case uranium the grains are composed of subgrains, the dis-orientation between some of these being too small to be determined optically. (auth)
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