230
Problem
80. What is the difference between electro-deposition and electro-spraying techniques? In the electro-spraying method, what will happen if your substance is
hygroscopic? Explain the effect of the source being non-uniform especially for
counting low energetic β-particles.
81. How does the geometry of the counter affect spurious pulses? And what are the
factors on which they depend?
82. What are the applications of a 4πγ -counter? What is meant by coincidence
counting? Describe the design of a counter to measure an activity of 2–6 cpm.
Describe the arrangements needed to introduce into a counter to reduce the spurious pulses down to almost zero.
83. Explain the principle of a semiconductor detector used for measuring the activity
of α-particles. Explain its advantages over other counters. Why is the background
activity in such counter very low even without using any lead shielding? Explain.
Problem
80. What is the difference between electro-deposition and electro-spraying techniques? In the electro-spraying method, what will happen if your substance is
hygroscopic? Explain the effect of the source being non-uniform especially for
counting low energetic β-particles.
81. How does the geometry of the counter affect spurious pulses? And what are the
factors on which they depend?
82. What are the applications of a 4πγ -counter? What is meant by coincidence
counting? Describe the design of a counter to measure an activity of 2–6 cpm.
Describe the arrangements needed to introduce into a counter to reduce the spurious pulses down to almost zero.
83. Explain the principle of a semiconductor detector used for measuring the activity
of α-particles. Explain its advantages over other counters. Why is the background
activity in such counter very low even without using any lead shielding? Explain.