1 Mass spectrometers, other than those specified in Dual-Use code 0B002.g. or 3A233, capable of measuring ions of 200 atomic mass units or more and having a resolution of better than 2 parts in 200, as follows, and ion sources therefor— a inductively coupled plasma mass spectrometers (ICP/MS); b glow discharge mass spectrometers (GDMS); c thermal ionisation mass spectrometers (TIMS); d electron bombardment mass spectrometers which have a source chamber constructed from, lined with or plated with materials resistant to corrosion by uranium hexafluoride (UF 6 ); e molecular beam mass spectrometers having either of the following characteristics: i a source chamber constructed from, lined with or plated with stainless steel or molybdenum and equipped with a cold trap capable of cooling to 193 K (– 80 °C) or less; or ii a source chamber constructed from, lined with or plated with materials resistant to uranium hexafluoride (UF 6 ); f mass spectrometers equipped with a micro-fluorination ion source designed for actinides or actinide fluorides. 2 In this paragraph “ materials resistant to corrosion by UF6 ” has the meaning given to it in the Dual-Use Regulation.