Last Updated:2025/11/19

The sample of protactinium weighed only a few milligrams, making it difficult for researchers to study its properties.

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The sample of protactinium weighed only a few milligrams, making it difficult for researchers to study its properties.

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そのプロタクチニウムの試料はわずか数ミリグラムしかなかったため、研究者がその性質を調べるのは困難だった。

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