The concentration of helium in tungsten fuzz-like nanostructures has been measured by means of thermal desorption spectroscopy. Fuzz was formed on the W surface under intensive plasma irradiation at 1500 K. The helium content was measured first in the as-irradiated sample, and then in a similar sample with the fuzz mechanically scraped from the sample surface. The difference gave the He content in the fuzz, which was estimated to be He/ W = (13 ± 4)%.
タングステンファズ状ナノ構造中のヘリウム濃度を、昇温脱離分光法により測定した。ファズは、1500 Kでの強力なプラズマ照射下でW表面に形成された。ヘリウム含有量は、まず照射ままの試料で測定され、次にファズを機械的に表面から削り取った類似の試料で測定された。その差からファズ中のヘリウム含有量が得られ、He/W = (13 ± 4)%と見積もられた。