...Note that because the tungsten filament of the cathode gradually deposits on the anticathode, in old X-ray tubes, the characteristic X-ray spectrum may contain a line spectrum specific to tungsten, so care must be taken. Another type of X-ray emitted from an X-ray tube is continuous X-rays (also called white X-rays), which have a continuous spectrum and are the result of bremsstrahlung radiation from incident electrons. The wavelength is unrelated to the anticathode material, but for short wavelengths, there is a limiting wavelength λ c determined by eV = hc /λ c , where V is the electron acceleration voltage, e is the elementary charge, and c is the speed of light in a vacuum (Duane-Hunt law). ... *Some of the terminology explanations that mention "continuous X-rays" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…なお,対陰極には陰極のタングステンフィラメントが少しずつ蒸着するため,古くなったX線管では,特性X線のスペクトル中にタングステン固有の線スペクトルが出ることがあり,注意を要する。 X線管から出るもう一つのX線は連続スペクトルをもつ連続X線continuous X‐rays(白色X線ともいう)で,入射電子の制動放射である。波長は対陰極物質とは無関係であるが,短波長側については,電子の加速電圧をV,電気素量をe,真空中の光速度をcとすると,eV=hc/λcで定まる限界波長λcがある(デュエン=ハントの法則)。… ※「continuous X-rays」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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