IRRSP Practice Test

IRRSP Practice Test The activity of a radioactive source - The term "Curie" defines: a. The exposure of a radioactive source b. The intensity of a radioactive source c. The activity of a radioactive source d. The output of a radioactive source Reddening of the skin, loss of hair, blistering - Which of the following are symptoms of an acute extremity overexposure? a. Nausea, vomiting, diarrhea b. Fatigue, nausea, reddening of the skin c. Diarrhea, blistering, loss of hair d. Reddening of the skin, loss of hair, blistering Higher gamma ray energy from the Co-60 - The reason the gamma radiation emitted from a Cobalt-60 source is more penetrating than the gamma radiation emitted from Iridium-192 is due to the: a. Higher output per Curie from the Co-60 b. Longer half life of the Co-60 c. Greater intensity from the Co-60 d. Higher gamma ray energy from the Co-60 3/4 - A 0.400 inch piece of lead shielding will reduce the radiation intensity from an Iridium- 192 source by: a. 3/4 b. 1/2 c. 1/4 d. 1/8 Thick section of high atomic number material - When shielding against high-energy gamma rays, which of the following characteristics provide the most effective shield? a. Thick section of material b. Thick section of high atomic number material c. Thick section of low atomic number material d. Thick section of low density material 2.31 R/hr - The radiation intensity at 1 foot from an Iridium-192 source is 452.4 R/hr. What is the radiation intensity at 14 feet? a. 2.31 R/hr b. 226.2 R/hr c. 113.1 R/hr d. 32.3 R/hr C - Gamma radiation can be defined as: (Answer with A, B, C, or D) a. Particles having the mass and charge of two protons and two neutrons emitted from the nucleus of an unstable atom b. Very light negatively charged particles emitted from the nucleus of an unstable atom c. Very short wavelength electromagnetic radiation emitted from the nucleus of an unstable atom d. Particles emitted from an unstable atom with an energy in the range of 1 to 10 M.E.V. Attenuation - The term that describes how gamma or x-rays are reduced in intensity when passing through shielding material is: a. Penetration b. Scatter c. Reflection d. Attenuation 5 Rem to the whole body, 50 Rem to the extremities - The annual radiation exposure limits for a radiographer or an assistant can be summarized by: a. 1.25 Rem to the whole body, 18.75 Rem to the extremities b. 20 Rem to the whole body, 200 Rem to the extremities c. 5 mRem to the whole body, 50 mRem to the extremities d. 5 Rem to the whole body, 50 Rem to the extremities 3.125 Curies - A 50 Curie Cobalt-60 source has decayed 4 half lives. What is the remaining activity? a. 6.25 Curies b. 3.125 Curies c. 0.195 Curies d. 1.56 Curies Inverse Square Law - The radiation intensity from a point source is inversely proportional to the square of the distance from the source. This is known as: a. Inverse Square Law b. Linear Absorption Coefficient c. Photoelectric Attenuation Process d. Ohm's Law Half value layer - The thickness of shielding material required to reduce a radiation intensity to one-half it's original value is known as the: a. Tenth value layer b. Half life c. Roentgen value layer d. Half value layer Protons - An element is identified by the number of _______ in it's nucleus. a. Photons b. Neutrons c. Electrons d. Protons Time, distance, shielding and ALARA considerations - What basic methods should a radiographer use to control exposure to radiation? a. Half life, shielding and distance b. Alarm rate meters, shielding and distance c. Shielding, film badges and distance d. Time, distance, shielding and ALARA considerations 64.5 feet and 456.1 feet - Using an unshielded 80 Curie Iridium-192 source, at what distances should the "High Radiation Area" and the "Restricted Area" boundaries be placed? a. 64.5 feet and 288.4 feet b. 2.04 feet and 144.2 feet c. 105.8 feet and 748.3 feet d. 64.5 feet and 456.1 feet B - "Saturation" of a Geiger Muller survey instrument refers to: (Answer with A, B, C, or D) a. A meter that malfunctions as a result of being water logged b. A survey meter that indicates a false zero reading when exposed to a high radiation intensity c. A meter that will not work on Saturdays