radioactivity

名词 n.
中文释义

英文释义

名词 n.
  1. Spontaneous emission of ionizing radiation as a consequence of a nuclear reaction, or directly from the breakdown of an unstable nucleus. uncountable,usually
    — Today, no one would intentionally smear radioactive materials on their face, but in 1933, the dangers of radioactivity were not yet fully understood.
  2. The radiation so emitted; including gamma rays, alpha particles, neutrons, electrons, positrons, etc. uncountable,usually

词形变化

radioactivities plural radio-activity alternative

词汇关系

下位词
alpha decay beta decay electron capture gamma decay spontaneous fission
衍生词
nonradioactivity
相关词
activity nuclear radiation radiation radiation poisoning radio- radioactive decay becquerel curie half-life

词源

From radioactive + -ity or radio- + activity.
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