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Chemical Technician (Analytical Chemistry) > Radiochemical Techniques > Flashcards

Radiochemical Techniques Flashcards

1
Q
  1. Which of the following are highly effective in producing ion pairs when they pass through the matter?
    a) Alpha particles
    b) Beta particles
    c) Gamma particles
    d) X-ray particles
A

a) Alpha particles

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2
Q
  1. Which of the following can liberate photo electrons
    when they fall on certain metals?
    a) Alpha particles
    b) Beta particles
    c) Gamma particles
    d) X-ray particles
A

d) X-ray particles

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3
Q
  1. Which of these particles are highly penetrating?
    a) Alpha particles
    b) Beta particles
    c) Gamma particles
    d) X-ray particles
A

c) Gamma particles

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4
Q
  1. 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 effect
A

d) Collision effect

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4
Q
  1. Alpha emission is characteristic of heavier radioactive elements such as thorium, uranium, etc.
    a) True
    b) False
A

a) True

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5
Q
  1. Which of the following formulae gives the expression for half-life of a radioactive isotope when ‘λ’ is the decay constant?
    a) 0.762/λ
    b) 0.693/λ
    c) 0.937/λ
A

b) 0.693/λ

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5
Q
  1. The stability of the nucleus can be predicted by which of the following?
    a) Electron to neutron ratio
    b) Neutron to proton ratio
    c) Proton to electron ratio
    d) Neutron to electron ratio
A

b) Neutron to proton ratio

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6
Q
  1. Which of the following is true about radiochemical
    methods?
    a) Eliminate the need for chemical preparation
    b) Not sensitive
    c) Not accurate
    d) Not specific
A

a) Eliminate the need for chemical preparation

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7
Q
  1. Which of the following emissions have low ionizing
    power?
    a) Alpha particles
    b) Beta particles
    c) Gamma particles
    d) X-ray particles
A

c) Gamma particles

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7
Q
  1. Which of the following effect occurs when a gamma ray and an electron make an elastic collision?
    a) Photoelectric effect
    b) Compton effect
    c) Pair production
    d) Collision effect
A

d) Collision effect

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8
Q
  1. Which of the following is not a type of radiation
    detectors?
    a) Geiger Muller counter
    b) Proportional counter
    c) Semiconductor detector
    d) Flame emission detector
A

d) Flame emission detector

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9
Q
  1. Which of the following effects transfers all the energy of the gamma ray to an electron in the inner orbit of the atom of the absorber?
    a) Photoelectric effect
    b) Compton effect
    c) Pair production
    d) Collision effect
A

a) Photoelectric effect

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10
Q
  1. The basic unit used to describe the energy of a
    radiation particle is curie.
    a) True
    b) False
A

b) False

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11
Q
  1. ‘When nuclear radiations pass through, gas ionization is produced.’ This is the principle of which of the following detectors?
    a) Proportional counter
    b) Flow counter
    c) Geiger Muller counter
    d) Scintillation counter
A

c) Geiger Muller counter

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12
Q
  1. Which of the following acts as quenching gas in Geiger Muller counter?
    a) Alcohol
    b) Argon gas
    c) Krypton
    d) Hydrogen
A

a) Alcohol

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13
Q
  1. Which of the following acts as ionising gas in Geiger
    Muller counter?
    a) Alcohol
    b) Argon gas
    c) Krypton
    d) Hydrogen
A

b) Argon gas

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14
Q
  1. Which of the detectors is similar to Geiger Muller
    counter in construction but is filled with heavier gas?
    a) Proportional counter
    b) Flow counter
    c) Semiconductor detector
    d) Scintillation counter
A

a) Proportional counter

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15
Q
  1. Which of the following gases are used in the
    proportional counter as the ionising gas?
    a) Alcohol
    b) Argon gas
    c) Krypton
    d) Hydrogen
A

c) Krypton

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16
Q
  1. Which of the following is the main disadvantage of solid
    state semiconductor detector?
    a) Low accuracy
    b) Low sensitivity
    c) It should be maintained at low temperature
    d) High pressure has to be produced
A

c) It should be maintained at low temperature

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16
Q
  1. Scintillation detector is a large flat crystal of which of
    the following materials?
    a) Sodium chloride
    b) Sodium iodide
    c) Sodium sulphate
    d) Sodium carbonate
A

a) Sodium chloride

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17
Q
  1. When X-ray enters the solid state detector it produces ion pair rather than electron-hole pair.
    a) True
    b) False
A

b) False

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18
Q
  1. Liquid samples must be counted using ionization
    chamber by placing them in which of the following?
    a) Test tube
    b) Curvette
    c) Ampoules
    d) Flask
A

c) Ampoules

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19
Q
  1. Which of the following materials are used as the
    insulation between the inner and outer electrodes of the ion chamber?
    a) Polythene
    b) Plastic
    c) Polytetrafluoroethylene
    d) Polyacrylamide
A

c) Polytetrafluoroethylene

20
Q
  1. Which of the following is not a component of gamma camera?
    a) Collimator
    b) Detector crystal
    c) Pre-amplifier
    d) Position logic circuit
A

c) Pre-amplifier

20
Q
  1. Gaseous compounds containing radioactive sources can be directly introduced into the ionization chamber.
    a) True
    b) False
21
Q
  1. Liquid Scintillators are used for which of the following materials?
    a) Low energy beta materials
    b) High energy beta materials
    c) Low energy gamma materials
    d) High energy gamma materials
A

a) Low energy beta materials

22
Q
  1. The first gamma camera is also known by which of the following names?
    a) Hal camera
    b) Anger camera
    c) Muller camera
    d) West camera
A

b) Anger camera

23
Q
  1. Which of the following is the first object that an emitted gamma photon encounters after exciting the body?
    a) Collimator
    b) Detector crystal
    c) Photo multiplier tubes
    d) Position logic circuit
A

c) Photo multiplier tubes

24
Q
  1. Which of the following is a pattern of holes through
    gamma ray absorbing material, usually lead or tungsten?
    a) Collimator
    b) Detector crystal
    c) Photo multiplier tubes
    d) Position circuitry
A

a) Collimator

25
Q
  1. 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 effect
A

a) Photoelectric effect

26
Q
  1. Which of the following components adds all the signals and determines where each scintillation event occurred in the detector?
    a) Collimator
    b) Detector crystal
    c) Photo multiplier tubes
    d) Position circuitry
A

d) Position circuitry

27
Q
  1. Gamma camera uses one scintillation detector.
    a) True
    b) False
28
Q
  1. Gamma camera uses which of these components to
    produce a position intensity picture of a radioactive area?
    a) Collimator
    b) Scintillation detector
    c) Photo multiplier tubes
    d) Position circuitry
A

b) Scintillation detector

29
Q
  1. Straight bore collimator is used for thyroid work in the medical field.
    a) True
    b) False
29
Q
  1. In liquid scintillation counter, which of the following is a fluorescent substance?
    a) Solvent
    b) Solute
    c) Crystal
    d) Reagent
30
Q
  1. 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 circuitry
A

b) Scintillator along with a photo multiplier tube

31
Q
  1. The reduction in counting efficiency of the scintillation detector is called as __________
    a) Disintegration
    b) Decay
    c) Quenching
    d) Reduction
A

c) Quenching

31
Q
  1. When UV light is absorbed by the fluor molecules the light emitted is in which of the following colours?
    a) Pink
    b) Red
    c) Green
    d) Blue
32
Q
  1. In liquid scintillation counter, which of the following is used to convert light into electrical signals?
    a) Photo multiplier tube
    b) Photo emissive tube
    c) Photo voltaic cell
    d) Photo reflector
A

a) Photo multiplier tube

33
Q
  1. Which of the following is not a type of quenching?
    a) Chemical quench
    b) Interference quench
    c) Colour quenching
    d) Self-absorption
A

b) Interference quench

34
Q
  1. In which type of quenching, the radiation emitted by the isotope is not detected due to absorption of the radiation by the sample itself?
    a) Chemical quench
    b) Interference quench
    c) Colour quenching
    d) Self-absorption
A

d) Self-absorption

35
Q
  1. Variation of gain with temperature does not cause
    instability.
    a) True
    b) False
36
Q
  1. Due to the presence of red, green and yellow colour in the vial, which of the following occurs?
    a) Chemical quench
    b) Interference quench
    c) Colour quenching
    d) Self-absorption
A

c) Colour quenching

37
Q
  1. A discriminator circuit is which of the following circuits?
    a) Wheatstone bridge
    b) Instrumentation amplifier
    c) Astable multivibrator
    d) Schmitt trigger
A

d) Schmitt trigger

38
Q
  1. A quench curve can be constructed by plotting the
    counting efficiency versus ____________
    a) Q-number
    b) Quench factor
    c) H-number
    d) Disintegrations
A

c) H-number

39
Q
  1. Photomultipliers used in Liquid scintillation detectors are a source of instability.
    a) True
    b) False
40
Q
  1. Which of the following is the function of the
    discriminator?
    a) Rejects signals below a certain voltage
    b) Rejects signals above a certain voltage
    c) Rejects signal in a range alone
    d) Filters noise alone
A

a) Rejects signals below a certain voltage

41
Q
  1. The difference between the pulses having amplitudes between the two triggering levels is called __________
    a) Pulse width
    b) Energy gap
    c) Window width
    d) Amplitude variation
A

c) Window width

42
Q
  1. The pulses having amplitudes between the two
    triggering levels are given by which of the following
    components?
    a) Pre-amplifiers
    b) Linear amplifiers
    c) Anti-coincidence circuits
    d) Discriminators
A

d) Discriminators

43
Q
  1. Schmitt triggers are followed by which of the following components?
    a) Pre-amplifier
    b) Linear amplifier
    c) Anti-coincidence circuit
    d) Discriminator
A

c) Anti-coincidence circuit

44
Q
  1. Which of the following components cancels all the
    pulses which trigger both the discriminators?
    a) Pre-amplifier
    b) Linear amplifier
    c) Anti-coincidence circuit
    d) Discriminator
A

c) Anti-coincidence circuit

45
Q
  1. If number of channels is more than ten, the problems of stability of discrimination voltages arise.
    a) True
    b) False
45
Q
  1. Which of the following is used when the number of
    channels is ten or less?
    a) Two discriminators in series
    b) Two discriminators in parallel
    c) Series array of discriminators
    d) Parallel array of discriminators
A

d) Parallel array of discriminators

46
Q
  1. The signal reaching which of the following components is the one lying in the window of pulse height analyser?
    a) Pre-amplifier
    b) Linear amplifier
    c) Counter
    d) Discriminator
A

c) Counter

47
Q
  1. The measurement of pulse height is useful for energy determination.
    a) True
    b) False

Chemical Technician (Analytical Chemistry) (16 decks)

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