Grade: I. Fill-in-the-Blank Questions: (2 points each) I. The SI unit of activit

Question

Grade: I. Fill-in-the-Blank Questions: (2 points each) I. The SI unit of activity is , the SI unit of absorbed dose is 2 We usually divide neutrons into two categories (fast and slow) based on their energy. The dividing line will be at eV, which is the (element) cutoff energy 3. is the time integral of the flux over the exposure duration is defined as full width at half maximum (FWHM) divided by the location of 4. the peak centroid Ho 5. one-half of its value in the absence of the absorber 6 The most common type of efficiency tabulated for gamma-ray detectors is is defined as the absorber thickness that reduces the particles count to exactly 7. An electron may undergo a large enough impulse that after having left its parent atom, it still may have sufficient kinetic energy to create further ions. These energetic electrons are called rays. 8. The predominant interaction mechanism for gamma-ray energies typical of radioisotope sources is 9. It is generally more common to operate detectors in which the time constant of the external circuit (t) is much than the detector charge collection time () 10. An approximate rule of thumb is that one should be able to resolve two energies that are separately by more than one of the detector II. Multiple-Choice Questions: (2 points each) 11. Radiation usually are conveniently categorized into some general types as ( A, D 1 ( Fast Electrons; B) Heavy Charged ParticlesElectromagnetic radiation: D, Neutrons. 12. Which of following radiations have a continuous spectra on energy? C. Gamma rays; D. Bremsstrahlung radiation; E. neutrino A. Alpha particle; B. Beta rays; from positron decay 13. What is the typical travel range of an alpha particle? ( A, 10 m; B. 10 cm; C. Imm; D. 1dm.

Explanation / Answer

1) Becquerel (Bq), Gray (Gy)

2) Dividing line is at 0.5 eV and Cadmium cut off energy

3) The Fluence is the time integral of flux over the exposure duration

4) Energy resolution

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