Radiation safety Exam Questions And Answers Verified 100% Correct

Radiation safety Exam Questions And Answers Verified 100% Correct the process that results in the removal of orbital electrons from atoms resulting in the formation of ion pairs is - ANSWER ionization the fact that gasses bombarded by ionizing radiation become conductors of electrical current make them useful in - ANSWER detection equipment a dosimeter must be capable of reading a range of - ANSWER 0-200 mR (0-2mSv) pocket ion chambers must be capable of reading - ANSWER 200 mR (2mSv) an exposure rate is measured by - ANSWER survey meter what dosimeters (dosimetric devices) are last affected by moisture - ANSWER TLDs full deflection of a survey meter while on batter check means - ANSWER meter may or may not be working properly dosimeters must be calibrated at intervals not to exceed - ANSWER annually rate alarms must be calibrated at intervals not to exceed - ANSWER yearly a film badge/TLD records what - ANSWER total dose history for the period worn when performing radiography in a permanent radiographic installation equipped with an area monitor, the technician is not required to - ANSWER wear a rate alarm a direct reading ionization chamber, such as a dosimeter, has the advantage of providing an - ANSWER immediate dose history since last time charged a radiographers survey meter is sowing 0 near the source; it can safely be assumed that: - ANSWER the meter is in an inoperable state, the radiographer should retreat from the source until an operational meter has replaced the suspect meter a radiographer reads 7.5 on the 10x scale of the survey meter. what is the current dose rate at that position - ANSWER 75 mR/h after 6 half-value layers, what percentage of radiation would be received - ANSWER 1.6% assuming a source has a half-life of 20 years, how old would the source be in 3 half- lives - ANSWER 60 years if a radiographer has 60 mR (0.6 mSv) at the surface of the exposure device, what would the reading be after 2 half lives - ANSWER 15mR a sealed source emits what - ANSWER gamma rays the ball on a source assembly that prevents the source from exiting through the back of the camera is called - ANSWER safety stop ball emission of gamma rays, alpha rays and beta rays is considered what - ANSWER characteristics of source decay to penetrate a thicker or denser material, you would need a source with - ANSWER more energy (shorter wavelength) an element's weight is the - ANSWER A number an element is identified by the number of _________ in its nucleus - ANSWER protons the first indication of an extremity radiation overexposure is - ANSWER reddening of the skin gamma radiation has a shorter wavelength than visible light, therefore making it - ANSWER more penetrating a radiation area is defined as "an area accessible to individuals, in which they could receive..." - ANSWER 5 mR/h a high radiation area is defined as "an area accessible to individuals, in which they could receive..." - ANSWER 100 mR/h a member of the public or unmonitored individual is allowed to receive up to, but not to exceed - ANSWER 2 mR/h, 100 mR/year when performing radiography in the field, regulations require the radiographer to post with physical barriers or signs the - ANSWER high radiation area and radiation area to which access is restricted for the purpose of controlling radiation exposure - ANSWER restricted area a radiographer and assistant are standing in a 2mR/h field. what would the assistant's total dose be after 4 h? - ANSWER 8.0 mR a radiographer is receiving 100 mR/h at the crank assembly. the crank assembly is 25ft in length. how long will it take for the radiographer to receive a total dose of 50 mR - ANSWER 30 minutes a non-declared pregnant radiographer or assistant may receive no more than - ANSWER 5 R per year a declared pregnant radiographer or assistant may receive no more than __________ for the entire pregnancy - ANSWER 500 mR an in-born fetus may receive no more than _______ for the entire pregnancy - ANSWER 500 mR a monitored person may receive up too 5000 mR per year. what would be considered an excessive amount of radiation exposure to that individual - ANSWER any unnecessary exposure to radiation the primary form of shielding provided by modern exposure devices - ANSWER depleted uranium (DU) a thickness of 0.19 in of lead will reduce the exposure of Ir-192 to one-half its original intensity. this is known as the - ANSWER half-value lay of lead for the energies associated with Ir-192 fixed facilities, also known as shooting rooms, must be inspected at regular intervals to ensure that all visible and audible warning signals are in place and operable. this is documented - ANSWER daily prior to use when high-speed electrons strike a hard surface (target) which is not a result - ANSWER neutron beans what does the bremsstrahlung effect generate - ANSWER x-rays and heat the filament of an x-ray tube is energized by electrical current. the difference in the electrical potential draws the free electrons to the _____. as they strike at such a high speed, x-rays are produced by the bremsstrahulung process - ANSWER target high-speed electrons striking a target produce primarily what - ANSWER heat x-ray machines work on the principle of bremsstrahulung or braking. which component is not required to produce this effect - ANSWER focusing cap