Before revision: This method produced a dangerous degree of long-term residual radioactivity and is no longer in use, although radium-treated diamonds are still found in markets and can be detected by particle detectors such as the Geiger counter, the scintillation counter, or the semiconductor detector .
After revision: This method produced a dangerous degree of long-term residual radioactivity and is no longer in use, Some of these—which radium-treated diamonds are still found in markets and can be detected by particle detectors such as the Geiger counter, the scintillation counter, or the semiconductor detector .