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Laboratory Experiment 1

Laboratory Experiment 1. Vasily Arzhanov. Safety. Distance: keep yourself as far from radiation sources as possible Time: expose yourself to radiation as short time as possible Number: expose to radiation only minimal number of people. Experimental Setup. d = 6 ÷ 47 cm. d.

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Laboratory Experiment 1

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  1. Laboratory Experiment 1 Vasily Arzhanov

  2. Safety • Distance: keep yourself as far from radiation sources as possible • Time: expose yourself to radiation as short time as possible • Number: expose to radiation only minimal number of people Lab 1

  3. Experimental Setup d = 6 ÷ 47 cm d • Naming convention • Same distances • Time scaling Cd Sphere Lab 1

  4. Detection Technique 97% α Channel 1: γ Detector γ PM Eu γ α 3% 6Li n Channel 2: t Eu γ Fiss. prod. Lab 1

  5. Multi-Channel Analyser Counts Channel n Channel n-1 Amplitude 0 … A1 An-1 An Amax Time Lab 1

  6. Lab 1

  7. Summary • Set/remove the Cd sphere • Set a distance • Acquire data • Save to a file • Set channels to sum up counts • Scale the counts to the reference time • Write down the result Lab 1

  8. One-Speed Diffusion Theory S0 r > 3λs Distance at which Diffusion theory is valid Isotropic source of thermal (slow) neutrons Lab 1

  9. Differential Measurement Lab 1

  10. Diffusion Length Thermal neutron absorbed Thermal (slow) neutron borne r Average over the neutron population Lab 1

  11. Migration Area (Length) Ordinary measurement Thermal neutron absorbed Fast neutron borne r Differential measurement rs rth Fast neutron thermalized Lab 1

  12. Orthogonality Property Fast neutron borne Thermal neutron absorbed θ θ θave = 90 θave = 0 Fast neutron thermalized Lab 1

  13. Calculation of Migration Lab 1

  14. Evaluating Integrals log r2A(r) Ordinary meas. Lab 1

  15. Relaxation Length No absorption r S0 Absorption Absorption Uncollided flux First collision Lab 1

  16. Summary Lab 1

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