KJM5911 Lab Exercise 4 - Szilard-Chalmers Reaction and Liquid-Scintillation Counting
After this exercise, you should know about and understand the following topics:
- The difference between radioactivity with or without carrier.
- Szilard-Chalmers method to produce carrier-free radioactive halides.
- Understand the theory behind Liquid Scintillation detection.
- Understand how the detection equipment in Liquid Scintillation works.
- Yield in Neutron Activation and Nuclear Reactions
- The 238Pu/9Be n-source
- Nucleus Recoil-Energy in Neutron Capture Reactions
- Szilard-Chalmers Reaction
- Introduction to Liquid Scintillation
- LSC Principles
- Interfering Processes
- Student Guide - Practical Exercise For Liquid Scintillation
- Student Guide - Practical Exercise For Szilard-Chalmers Reaction
For this exercise you should write a report with a two-page limit explaining about what you did and your results.
- Only the supervisor is allowed to fetch irradiated ethyliodine, no one else is authorized to handle the n source. The radiation field close to the source is rather intense and all handling is done with remote manipulation-tools. If you company your supervisor to watch, ensure that you stand at least one metre away from the source.
- The amount of radioactivity after the n irradiation is barely measurable, so normal C-type lab rules apply. The short half-life makes it easy to handle waste and possible contaminations - it will be gone by tomorrow.
- Normal chem. lab safety rules should of course be followed, but there are no particular dangers.
- Make sure to ballance the centrifuge properly, and remember that the density of the ethyliodide solution is much higher than the one for water!