KJM5911 Lab Exercise 5 - Cyclotron Produced Tracers and Liquid-Liquid Extraction

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Learning Goals

After this exercise you should:

  • Understand how a high-energy particle beam can be used to produce radioactivity.
  • Understand how (radioactive) ions can be transported by attachment to aeorosol particles.
  • Have some experience with gamma spectroscopy on "freshly" made activity (mixture of short and long half-lives).
  • Have some practical experience with liquid-liquid extraction and measurement of the distribution of a given species between the two phases.
  • Understand the basic principles of how a cyclotron works and how a typical cyclotron lab lay-out looks like.


Experimental Procedure

Part 1: Producing 93mMo in a (alpha, n) reaction

  • Welcome to the Oslo Cyclotron Laboratory.
  • Target setup and gas-jet transfer system.
  • Catching 93mMo on a filter in the chem.lab.
  • Analysing the gamma spectrum

Part 2: Liquid-liquid extraction of Mo

  • Preparing liquids and equipment.
  • Extraction curve as function TOA concentration.
    • Perform extractions with 93mMo tracer
    • Plot extraction data and analyse curve

Part 3: Clean up

  • Clean all equipment and collect rad. waste in designated bottles.
  • Prepare all waste for collection/disposal.
  • Check workspace for contamination.


Your training do not authorise you for SA-02 (OCL experiment hall) or SA-03 (OCL chemistry lab). Thus, you need to be supervised at all times. Do not wander off on your own.

  • OCL has a hand&feet monitor, use this regularerly to check for contamination and always before you leave the lab.
  • The organic phase used for the LLE is highly flamable and carciogenic. Take proper care to avoid spills and evaporation from your beakers etc. Never clean your equipment in the sink if there is any organic residues left - it will quickly smell very bad.
  • Make sure you know how to trigger the automatic fire-fighting system and that you know how to use the emergency shower and eye wash.
  • In case of a major accident with e.g. a bottle containing the organic solution immediately evacuta the area. There is gas-mask availble for the subsequent clean-up, but the clean-up should only be started after consulting with your supervisor.
  • In the cyclotron vault there will be an intense radiation field also after the particle beam has been switched off (~10-50 mSv/h close to the target chamber). You are not allowed to enter the vault unless escorted.
  • The amount of radiation in the chemistry lab will be very small, but be aware of aerosols from the gas-jet and filter catch arrangement. Never operate this equipment on your own, but consult with your supervisor.
  • The cyclotron lab contains many dangers in the form of heavy equipment, high voltages, activated equipment and material, vacuum, compressed gasses, powerful magnetic fields, etc., etc. Be careful and stay away from all equipment you do not now.