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Practice Exam
Typical Examination Questions
- In general, the body cells most susceptible to damage by radiation are those found in:
- rigid or semi rigid tissues
- muscle tissues
- rapidly dividing tissues
- highly specialized tissues
- nerve tissues
- In a picocurie of any radioactive substance, the disintegration rate is:
- 2.22 dpm
- 2.22 x 106 dpm
- 37,000,000 dpm
- 3.7 x 104 dps
- 3.7 x 1010 dps
- Which of the following radionuclides cannot be detected by gamma spectrometry pulse height analysis?
- Hydrogen-3
- Iodine-131
- Cerium-144
- Ruthenium-106
- Cesium-137
- The elemental symbols for Boron, Beryllium, Cadmium, and Calcium are;
- Bo, B, Ca, C
- B, By, Cd, Ca
- Bo, Be, Cd, Ca
- B, Be, Cd, Ca
- B, Br, Ca, Cl
- Which of the following radionuclides is most suited to in-vivo measurements?
- Hydrogen-3
- Carbon-14
- Strontium-90
- Iodine-131
- Plutonium-239
- How long must a sample with a count rate of 300 cpm be counted to give a total count rate standard deviation of 1%?
- 3.5 min
- 17 min
- 30 min
- 33 min
- 65 min
- At what radius would you post a radiation area around an 8 curie Cesium 137 (662 Kev photon energy and a photon yield of 0.85 photons/disintegration) point source?
- 10 feet
- 74 feet
- 145 feet
- 53 feet
- 101 feet
- An air filter with a collection efficiency of 99.97% is being used in a decontamination effort. Calculate the decontamination factor for this filter.
- 9997
- 0.9997
- 3000
- 10,000
- 3333
- During an emergency in a DOE regulated facility, with known or potential high radiation fields, exposure to personnel must be voluntary if it is anticipated that such exposure may exceed a whole body exposure of:
- 5 rem
- 10 rem
- 25 rem
- 75 rem
- 100 rem
- A worker is to perform maintenance on a Reactor Coolant pump under the following radiological conditions; Dose rate on contact with the pump - 350 mrem/hr, Dose rate at 30 cm from the pump (working area dose rate) is 85 mrem/hr, and an airborne concentration of .45 DAC. She will spend a maximum of 14 hours in this area during the week. According to 10CFR20, how is this area to be posted?
- Danger High Radiation Area, Airborne Radioactivity Area
- Caution Radiation Area, Airborne Radioactivity Area
- Caution High Radiation Area, Airborne Radioactivity Area
- Caution Airborne Radioactivity Area
- Caution Radiation Area
- For an exclusive use vehicle that is transporting radioactive materials, radiation levels on contact with any external surface of the vehicle must not exceed:
- 0.01 mSv/hour
- 0.02 mSv/hour
- 0.1 mSv/hour
- 2.0 mSv/hour
- 10.00 mSv/hour
- Two categories of ionization are:
- alpha and beta
- direct and indirect
- microwave and infrared
- charged and uncharged
- molecular and atomic
- Intrinsic efficiency of a detector expresses the:
- probability that a count will be recorded if radiation enters the sensitive volume.
- ability of an instrument to count different energies.
- percent of gamma energy producing ion pairs.
- total detector counts minus the background.
- total beta/gamma counts by a tissue equivalent detector
- The antiparticle of a positron is a:
- proton
- neutrino
- electron
- meson
- neutron
- Forms of the same chemical element that contain different numbers of neutrons are called:
- isobars
- isomers
- radionuclides
- isotones
- isotopes
- An atom of a radionuclide that has a low neutron to proton ratio, and an atomic rest mass energy that is 1.02 Mev greater than the product atom's rest mass energy may decay by which of the following?
- Either positron emission or electron capture
- Annihilation
- Beta minus emission
- Isomeric transition
- Internal conversion
- Which radioactive decay series includes Ra-226 as one of its decay products?
- Thorium
- Uranium
- Actinium
- Neptunium
- Polonium
- An individual who receives an acute, whole body (DDE) radiation exposure of approximately 8 Gy will likely suffer symptoms of up to which level of the Acute Radiation Syndrome?
- Subclinical
- Hemopoietic
- Gastrointestinal
- Central Nervous System
- Not enough exposure to classify
- The term "isokinetic sampling" refers to the procedure of using sampling velocity that is exactly equal to the:
- velocity of the gas stream at the point of sampling
- velocity at the center of the main gas stream corrected for temperature and pressure
- velocity at the center of the main gas stream
- velocity of the gas stream adjacent to the duct wall
- average velocity of the main gas stream
- In which of the following radioactive decays will the daughter product be an isobar of the parent?
- alpha decay
- gamma decay
- neutron decay (elastic scatter)
- positron decay
- neutron decay (inelastic scatter)
- The respiratory protection device of choice for entry into an atmosphere immediately dangerous to life and health is a (an):
- supplied air hood
- air-purifying respirator equipped with a high efficiency filter
- air-purifying respirator, full face piece, equipped with organic vapor canister
- self-contained breathing apparatus equipped with a pressure demand regulator
- self-contained breathing apparatus equipped with a demand type regulator
- The average distance of travel in a medium between interactions, describes a photon's:
- mass energy absorption coefficient
- mean free path
- linear attenuation coefficient
- Compton cross section
- linear energy transfer
- The Bragg-Gray principle is based upon the relationship of:
- secondary charged particle equilibrium requirements and the thickness of the wall material of the chamber.
- ionization in an air-filled ionization chamber to the dose in air
- ionization of the gas in an ionization chamber to the dose in the wall material
- ionization in a gas-filled ionization chamber to the dose in the gas
- scatter of low energy photons to the probability of ionization in the chamber
- Given a gamma-energy value of 0.662 Mev, and a photon yield of 0.85 per decay, the exposure rate at 2 yards from an unshielded 10 mCi Cs-137 point source is:
- 1.10 R/hour
- 0.55 R/hour
- 5.50 R/hour
- 0.55 mR/hour
- 0.94 mR/hour
- A radionuclide has a decay constant of 0.1314/years, a gamma energy (per disintegration) of 2.50 MeV, and will produce a dose rate of approximately 30 R/hr at one foot from a 2 Curie source. Calculate the radiological half-life of this nuclide:
- 5.27 years
- 229 years
- 3.93 years
- 30.1 years
- 0.0231 years