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Developments in gamma spectrometry

Explore the advancements in gamma spectrometry, including photoelectric absorption, Compton scattering, and pair production. Learn about the components of a gamma-ray spectrometer system and how using a small size PMT can enhance detector efficiency.

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Developments in gamma spectrometry

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  1. Alexandria University, Faculty of Engineering Nuclear Engineering Department JINR, Frank Laboratory of Neutron Physics Department of Neutron Activation Analysis Developments in gamma spectrometry Ashraf KAKA Supervisor: Dr. Marina FRONTASYEVA

  2. General considerations in gamma-ray spectrometry 1 Photoelectric absorption 2 Compton scattering 3 Pair production

  3. Photoelectric absorption

  4. Compton Scattering

  5. Pair Production 511 eV

  6. Probability of interaction of photon with matter

  7. Gamma-ray spectrometer system

  8. Preamplifier The pulses produced in the detector are very small and so the charge sensitive preamplifier, usually a field-effect transistor (FET), is mounted as close to the detector as possible

  9. Amplifier • The amplifier increases the size of the small signal from the output of the preamplifier to a pulse of amplitude up to about 10 V, dependent on the gain setting • The second purpose of the amplifier is to improve the signal to noise ratio of the given pulses

  10. Photo multiplier tube(PMTS)

  11. Conclusion The quality of gamma-spectrometers can be improved by using of a small size PMT to increase the efficiency of the detector and to minimize its size

  12. Thank you for attention!

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