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51.

When the energy of an absorbed gamma photon is released, a flash of light is produced. This is similar to which of the following effects?(a) Photoelectric effect(b) Compton effect(c) Pair production(d) Collision effectThe question was asked in a job interview.My question comes from Gamma Camera topic in chapter Radiochemical Techniques of Analytical Instrumentation

Answer»

The CORRECT answer is (a) Photoelectric effect

To explain I would say: The GIVEN effect is SIMILAR to the photoelectric effect. It occurs in a scintillation DETECTOR.
Discussion
52.

Which of the following is known as a scintillation counter?(a) Scintillator(b) Scintillator along with a photo multiplier tube(c) Scintillator along with the crystal(d) Scintillator along with position circuitryI had been asked this question in unit test.Query is from Gamma Camera topic in chapter Radiochemical Techniques of Analytical Instrumentation

Answer»

The CORRECT choice is (B) Scintillator ALONG with a photo multiplier TUBE

To ELABORATE: Scintillation detector along with a photo multiplier tube is known as scintillation counter. Scintillation is the process of turning radioactive energy into light using a scintillator.
Discussion
53.

Which of these particles are highly penetrating?(a) Alpha particles(b) Beta particles(c) Gamma particles(d) X-ray particlesI got this question during an interview for a job.This is a very interesting question from Fundamentals of Radiochemical Methods topic in division Radiochemical Techniques of Analytical Instrumentation

Answer» CORRECT answer is (c) Gamma particles

To elaborate: Gamma particles are highly penetrating. Upon INTERACTION with MATTER, they LOSE energy in three modes.
Discussion
54.

When X-ray enters the solid state detector it produces ion pair rather than electron-hole pair.(a) True(b) FalseThis question was posed to me during a job interview.The origin of the question is Radiation Detectors in division Radiochemical Techniques of Analytical Instrumentation

Answer» RIGHT choice is (b) False

Explanation: When X-ray enters the SOLID state detector it produces electron-hole pair rather than an ion pair. The output SIGNAL is TAKEN from an ALUMINIUM layer.
Discussion
55.

Which of the following is not a mode by which beta particles lose energy on interaction with matter?(a) Photoelectric effect(b) Compton effect(c) Pair production(d) Collision effectThe question was asked in final exam.I would like to ask this question from Fundamentals of Radiochemical Methods in section Radiochemical Techniques of Analytical Instrumentation

Answer» RIGHT answer is (d) Collision effect

Easiest explanation: Upon INTERACTION with matter, gamma rays lose energy in THREE MODES. They are PHOTOELECTRIC effect, pair production and Compton Effect.
Discussion