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IRRSP PRACTICE TEST
A 40 Curie Iridium- 192 source is approximately equal to: (1 Ci = 37 Gbq) a. 1480 GBq b. 10 GBq c. 2 GBq d. 10,480 GBq - ANSWERS- 1480 GBq What is the process by which x-rays are produced in an industrial x- ray machine? a. Inelastic scatter b. Absorption c. Bremsstrahlung d. Vapor recoil effect - ANSWERS-Bremsstrahlung The process that results in the removal of orbital electrons from atoms resulting in the formation of ion pairs: a. Excitation b. Radioactivity c. Ionization d. Thermalization - ANSWERS-Ionization
Which of the following is not a primary component for the production of radiation when using x-ray machines? (Answer with A, B, C, or D) a. High voltage generator b. X-ray control c. Tube housing assembly d. Beam limiting device, and necessary supporting structures - ANSWERS-D The three ways of controlling x-ray machine radiation output are: a. Time, distance and voltage b. Time, distance and shielding c. Distance, shielding and sand d. Voltage, mA and time - ANSWERS-Voltage, mA and time When operating an x-ray machine at 300 kVp, what is the average energy of x-rays produced? a. 900 keV b. 300 keV c. 100 keV d. 1.3 meV - ANSWERS- 100 keV The term "Curie" defines: a. The exposure of a radioactive source
c. 1/ d. 1/8 - ANSWERS-3/ 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 - ANSWERS-Thick section of high atomic number material The radiation intensity at 1 foot from an Iridium- 192 source is 452. 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 - ANSWERS-2.31 R/hr 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. - ANSWERS-C 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 - ANSWERS-Attenuation 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 - ANSWERS- 5 Rem to the whole body, 50 Rem to the extremities 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
b. Alarm rate meters, shielding and distance c. Shielding, film badges and distance d. Time, distance, shielding and ALARA considerations - ANSWERS- Time, distance, shielding and ALARA considerations 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 - ANSWERS-64.5 feet and 456.1 feet "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 d. A meter that is damaged - ANSWERS-B An Iridium- 192 source that was originally 110 Curies has decayed for 222 days. At what distance from the source should a radiographer place the "Restricted Area" boundary? a. 189.1 feet
b. 411.1 feet c. 119.6 feet d. 534.8 feet - ANSWERS-189.1 feet Radiation detection instruments measure exposure to radiation based on the principal of: a. The inverse square law b. Mitosis c. Attenuation d. Ionization - ANSWERS-Ionization Before the first radiographic exposure, a radiographer performs a reference survey of his exposure device containing 100 Curies of Iridium-192. During this survey, he observes a zero reading on his survey meter. The radiographer should: (Answer with A, B, C, or D) a. Proceed with radiographic operations as a zero reading indicates a safe radiation level b. Assume the exposure device is empty based on the survey c. Expose the source and perform more surveys to confirm the survey meter responds d. Assume the survey meter is not working properly. The exposure device must be surveyed with another survey meter - ANSWERS-D A radiographer discovers that his pocket dosimeter is "off scale" during a lunch break. The radiographer should:
c. Identity and signature of the radiographers, date the equipment was used including the dates removed and returned to storage, make and model, serial number of the device, location or site of use d. Location or site of use, the distance to the Restricted area boundary, make and model of the exposure device, names of the radiographers - ANSWERS-C Formal inspection and maintenance of radiographic exposure devices and associated equipment must be performed every: a. 1 month b. 3 months c. 6 months d. 12 months - ANSWERS- 3 months The "Restricted Area" boundary is established where the exposure could exceed: a. 5 mR/hr, 500 mR/yr b. 2 mR/hr, 100 mR/yr c. 2 mR/hr, 100 mR in 7 consecutive days, 500 mR/hr d. 100 mR/yr - ANSWERS- 2 mR/hr, 100 mR/yr The "High Radiation Area" boundary is established where the exposure could exceed: a. 500 mR/hr b. 100 mR/hr c. 5 mR/hr
d. 2 mR/hr - ANSWERS- 100 mR/hr After terminating a radiographic exposure, radiographers are required to perform a survey of: (Answer with A, B, C, or D) a. The specimen that was being radiographed b. The "Restricted Area" boundary c. The exposure device, entire length of source guide tube and collimator if used d. The exposure device - ANSWERS-C A survey meter dial reads 1-10 with units of mR/hr and has three scales; x1, x10 and x100. What is the measured radiation intensity when the needle is on the 3 and the scale is x100? a. 3 mR/hr b. 30 mR/hr c. 100 mR/hr d. 300 mR/hr - ANSWERS- 300 mR/hr Leak test are performed periodically to determine if removable contamination limits are in excess of 0.005 microCuries (uCi). The required leak test for industrial radiography are: (Answer with A, B, C, or D) a. Perform a leak test of the sealed source every 12 months b. Perform a leak test of the sealed source every 3 months
a. Provide some shielding of the sealed source during transit to and from the exposure device b. Provide a visual indication where the sealed source will travel c. Provide a protected means to project the sealed source to and from the exposure device to a fixed focal point d. Provide a handle to drag the exposure device from one location to another - ANSWERS-C An exposure device containing 95 Curies of Iridium- 192 has a surface radiation level of 100 mR/hr. After 74 days, what would be the expected radiation level on the surface of the exposure device? a. 47.5 Curies b. 50 mR/hr c. 100 mR/hr d. 47.5 mR/hr - ANSWERS- 50 mR/hr The radiation intensity at 1 foot from an Iridium- 192 source is 598 R/hr. What is the radiation intensity at 25 feet from this source? a. 0.957 R/hr b. 0.010 R/hr c. 23.90 R/hr d. 5.980 R/hr - ANSWERS-0.957 R/hr Alarm rate meters are required to sound an audible warning at what radiation intensity? a. 500 Rem
b. 2 mR/hr c. 500 mR/hr d. 200 mR/hr - ANSWERS- 500 mR/hr During a radiographic exposure the radiographer and the assistant radiographer should: (Answer with A, B, C, or D) a. Maintain continuous direct surveillance of the High Radiation area and perform a survey of the Restricted area boundary to ensure 2 mR/hr or less b. Survey the High Radiation and Restricted area boundaries to confirm proper Placement c. Process film during the exposure to increase productivity d. Catch up on paperwork requirements - ANSWERS-A The USNRC's requirements for industrial radiography are contained in the following regulations: (Answer with A, B, C, or D) a. 49 CFR Parts 171 - 179 b. 10 CFR Parts 19, 20, 21, 30, 34, 71 c. 49 CFR Part 99 d. Nureg 1600 - ANSWERS-B In controlling exposure to x-rays, which of the following is true? (Answer with A, B, C, or D)
c. Be under visual surveillance by the radiographer whenever opened d. Be capable of reducing radiation levels to less than 5 mR/hr - ANSWERS-B Using a 50 Curie Iridium- 192 source and a 3 HVL collimator, what is the distance a radiographer must place the Restricted area boundary? a. 19 feet b. 127 feet c. 222 feet d. 81 feet - ANSWERS- 127 feet The primary reason over-exposures to radiography personnel occur is due to: (Answer with A, B, C, or D) a. Insufficient training in the handling and use of radiation exposure devices and x-ray generators b. Malfunctions of exposure devices and associated equipment or x- ray generators c. Radiography personnel failing to perform required surveys after radiographic exposures d. Survey meter malfunctions - ANSWERS-C A Sievert is a unit of: a. Activity b. Radiation dose
c. Dose rate d. Source focal size - ANSWERS-Radiation dose During a radiographic exposure using a x-ray machine, the radiographer is required to stop the exposure. What should he do? a. Ask the RSO for assistance b. Turn the mA and kV controls back to zero c. Turn the line switch OFF d. Let the automatic timer run down to shut the generator OFF - ANSWERS-Turn the line switch OFF The use of 4 half value layers of shielding will reduce an intensity by a factor of: a. 4 b. 8 c. 16 d. 32 - ANSWERS- 16
