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I am very impressed with this instructable. You have an excellent understanding of the principles involved. Some peoples' comments reveal a lack of the necessary analytical skills to build and troubleshoot this project. If this is you, reader, please consider another project. At least with N2 there is no chemical explosion risk (there is a gas expansion danger, though). Liquid Ammonia or Oxygen at home? Go ahead and buy your coffin now (but don't keep it near your 'generator'). Again, I enjoyed the instructable you made.
3D CAD and printing kills this project for me, immediately. Admittedly a pretty advanced project at that.
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This is the best summary of radiation and high energy particle physics I have ever encountered.
A lot of the comments here are irrelevant, or offer some different, and irrelevant, cure suggestion. Save time, just stick to this instructable.