DOE CORE (RCT) PRACTICE EXAM AND FINAL
STUDY GUIDE LATEST EXAM ACTUAL EXAM
QUESTIONS AND CORRECT DETAILED
ANSWERS |ALREADY GRADED A+
The effective half-life is always ___ the radiological half-life - CORRECT
ANSWER ✔✔- Less than
A chelating agent increases the elimination rate of radioactive materials from the
body by: - CORRECT ANSWER ✔✔- Increasing the solubility of insoluble
compounds
The component in a photomultiplier tube that converts the light output to
photoelectrons is called - CORRECT ANSWER ✔✔- Photocathode
In the operation of an ion chamber the signal produced by ion pairs in the chamber
- CORRECT ANSWER ✔✔- Stays the same as the applied voltage is increased or
decreased in the ion chamber region
The main advantage of semiconductor detectors for spectroscopy systems is their
higher - CORRECT ANSWER ✔✔- Resolution
In a gas filled detector for alpha & beta particles to be detected, they need to react
w/ atoms: - CORRECT ANSWER ✔✔- In the fill gas
1|Page
,In a gas filled detector that operates in the ionization chamber region of the gas
amplification curve - CORRECT ANSWER ✔✔- Every ion pair produced is
collected on the electrodes. There is no recombination & no gas amplification
Which of the following is the approximate beta efficiency range (in %) for ion
chambers - CORRECT ANSWER ✔✔- 20-25%
A BF# detector can be used to measure fast neutrons when - CORRECT ANSWER
✔✔- A suitable moderator is employed
The primary method of electronic discrimination employed in radiation detection
instruments is: - CORRECT ANSWER ✔✔- Analyzing pulse heights
Typical use of scintillation & semiconductor detectors are: - CORRECT ANSWER
✔✔- Radiochemistry & Health Physics counting lab applications
The Lower Limit of Detection (LLD) for a detector is dependent upon the
following factors EXCEPT: - CORRECT ANSWER ✔✔- Sample volume
Atomic Mass - CORRECT ANSWER ✔✔- The actual weight of a particular
isotope in AMU
The atomic # is the # of: - CORRECT ANSWER ✔✔- Protons in the nucleus
The periodic table of the elements lists all known elements in order of: -
CORRECT ANSWER ✔✔- Increasing atomic #
2|Page
, An action on an object that could cause the object to change speed or direction is
identified as - CORRECT ANSWER ✔✔- Force
The Law of Conservation of Energy states that the: - CORRECT ANSWER ✔✔-
Total amount of energy in a closed system remains unchanged
When the nucleons are combined to form a nucleus some of the mass is: -
CORRECT ANSWER ✔✔- Converted to binding. energy
The equation E=mc^2 states that: - CORRECT ANSWER ✔✔- Mass & energy are
equivalent
When two or more light nuclei combine to from a large nucleus in fusion, this
changes the: - CORRECT ANSWER ✔✔- Binding energy
Isotopes are defined as nuclides w/ the same: - CORRECT ANSWER ✔✔- # of
protons but a different # of neutrons
The average dose, to the general population of the US, from all combined medical
exposures as part of man-made background radiation sources is approximately -
CORRECT ANSWER ✔✔- 53 mRem/yr
The average dose, to the general population of the US, from consumer products as
part of man-made background radiation sources is approximately - CORRECT
ANSWER ✔✔- 10 mRem/yr
The factor which contributes the greatest variability in dose from natural cosmic
background radiation is - CORRECT ANSWER ✔✔- Altitude
3|Page
STUDY GUIDE LATEST EXAM ACTUAL EXAM
QUESTIONS AND CORRECT DETAILED
ANSWERS |ALREADY GRADED A+
The effective half-life is always ___ the radiological half-life - CORRECT
ANSWER ✔✔- Less than
A chelating agent increases the elimination rate of radioactive materials from the
body by: - CORRECT ANSWER ✔✔- Increasing the solubility of insoluble
compounds
The component in a photomultiplier tube that converts the light output to
photoelectrons is called - CORRECT ANSWER ✔✔- Photocathode
In the operation of an ion chamber the signal produced by ion pairs in the chamber
- CORRECT ANSWER ✔✔- Stays the same as the applied voltage is increased or
decreased in the ion chamber region
The main advantage of semiconductor detectors for spectroscopy systems is their
higher - CORRECT ANSWER ✔✔- Resolution
In a gas filled detector for alpha & beta particles to be detected, they need to react
w/ atoms: - CORRECT ANSWER ✔✔- In the fill gas
1|Page
,In a gas filled detector that operates in the ionization chamber region of the gas
amplification curve - CORRECT ANSWER ✔✔- Every ion pair produced is
collected on the electrodes. There is no recombination & no gas amplification
Which of the following is the approximate beta efficiency range (in %) for ion
chambers - CORRECT ANSWER ✔✔- 20-25%
A BF# detector can be used to measure fast neutrons when - CORRECT ANSWER
✔✔- A suitable moderator is employed
The primary method of electronic discrimination employed in radiation detection
instruments is: - CORRECT ANSWER ✔✔- Analyzing pulse heights
Typical use of scintillation & semiconductor detectors are: - CORRECT ANSWER
✔✔- Radiochemistry & Health Physics counting lab applications
The Lower Limit of Detection (LLD) for a detector is dependent upon the
following factors EXCEPT: - CORRECT ANSWER ✔✔- Sample volume
Atomic Mass - CORRECT ANSWER ✔✔- The actual weight of a particular
isotope in AMU
The atomic # is the # of: - CORRECT ANSWER ✔✔- Protons in the nucleus
The periodic table of the elements lists all known elements in order of: -
CORRECT ANSWER ✔✔- Increasing atomic #
2|Page
, An action on an object that could cause the object to change speed or direction is
identified as - CORRECT ANSWER ✔✔- Force
The Law of Conservation of Energy states that the: - CORRECT ANSWER ✔✔-
Total amount of energy in a closed system remains unchanged
When the nucleons are combined to form a nucleus some of the mass is: -
CORRECT ANSWER ✔✔- Converted to binding. energy
The equation E=mc^2 states that: - CORRECT ANSWER ✔✔- Mass & energy are
equivalent
When two or more light nuclei combine to from a large nucleus in fusion, this
changes the: - CORRECT ANSWER ✔✔- Binding energy
Isotopes are defined as nuclides w/ the same: - CORRECT ANSWER ✔✔- # of
protons but a different # of neutrons
The average dose, to the general population of the US, from all combined medical
exposures as part of man-made background radiation sources is approximately -
CORRECT ANSWER ✔✔- 53 mRem/yr
The average dose, to the general population of the US, from consumer products as
part of man-made background radiation sources is approximately - CORRECT
ANSWER ✔✔- 10 mRem/yr
The factor which contributes the greatest variability in dose from natural cosmic
background radiation is - CORRECT ANSWER ✔✔- Altitude
3|Page
