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  1. Gold-201 is a beta/gamma emitter with a 26 minute halflife.
  2. Mercury-201 is stable and makes up 13.22% of natural Mercury.
  3. Thallium-201 is a gamma emitter decaying by K capture with a 72 hour halflife.
  4. Lead-201 is a gamma emitter decaying by K capture with a 8.4 hour halflife (or less depending on isomer).

Other elements can be produced with an AMU number of 201, but there halflives are really too short to be of practical interest.

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Q: What element has atomic mass of 201?
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