Radiation Safety Test Exam Questions And Answers Verified 100% Correct

Radiation Safety Test Exam Questions And Answers Verified 100% Correct If the peak energy of the x-ray beam is 140 kVp, the primary protective barrier should consist of _____ and extend ____ upward from the floor of the radiographer room. A. 1/32" Pb, 7 feet B. 1/16" Pb, 7 feet C. 1/32" Pb, 10 feet D. 1/16" Pb, 10 feet - ANSWER B. 1/16" Pb, 7 feet The exposure cord on a mobile radiographic unit must be a minimum of ___ feet. A. 10 B. 6 C. 8 D. 4 - ANSWER B. 6 Radiation-induced cancer, leukemia and generic effects follow which type of close- response relationship? A. non-linear, nonthreshold dose-response B. linear, non threshold dose response C. linear, threshold dose response D. nonlinear, threshold dose response - ANSWER B. linear, non threshold dose response The GSD from medical radiation exposure depends upon the: 1. average gonad dose per examination 2. number of people being examined any given year 3. total population - ANSWER all of the above According to NCRP report 160, the greatest source of natural background radiation exposure is: A. radon gas B. cosmic rays C. the body itself D. radioactive materials - ANSWER A. radon gas The production of large molecules from small molecules is termed: A. metabolism B. hormesis C. catabolism D. anabolism - ANSWER D. anabolism Radiation induced cancers follow a _______ dose-response relationship. A. nonlinear, threshold B. linear, threshold C. linear, non threshold D. nonlinear, nonthreshold - ANSWER C. linear, nonthreshold The most radiosensitive cells is the body are: A. lymphocytes B. muscle cells C. epithelial cells D. nerve cells - ANSWER A. lymphocytes A radiographer discovers that a patient is pregnant after the patient has had skull radiographs and a brain CT. What should the radiographer do? A. reassure the patient and send her home B. contact a physicist to estimate the fetal dose C. refer the patient to her family physician for a follow-up visit D. tell the patient to terminate her pregnancy - ANSWER B. contact a medical physicist to estimate the fetal dose A dose-response relationship that intersects the dose axis at zero is considered a _____ response. A. non threshold B. sigmoid C. extrapolated D. threshold - ANSWER A. nonthreshold Which of the following is the DL 15 rem (150 mSv)/year for occupationally exposed individuals? A. whole body exposure B. skin exposure C. eye lens exposure D. forearm exposure - ANSWER C. eye lens exposure When performing mobile radiographic examination, if the protection factors of distance and shielding are equal, the radiographer should stand at a ______ degree angle to the scattering object. - ANSWER 90 Which of the following is considered a late somatic effect? A. parkinson's disease B. carcinogenesis C. genetic effect D. alzheimer's disease - ANSWER B. carcinogenesis A woman who is 3 months pregnant has been in an automobile accident. The ER doctor suspects injury to her C-spine and feels justified in ordering x-rays to determine the extent of the patient's injury. The radiographer should: 1. select the smallest kVp necessary to produce a diagnostically useful radiograph 2. adequately and precisely collimate the X-ray beam to only include anatomy of interest 3. shield the patient's lower abdomen and pelvic region with a protective contact shield . - ANSWER 2 and 3 only Note: using a small kVp means compensating with a larger mAs and increasing patient dose In the diagnostic range of energies (30-150 kVp), which of the following tissues possess the greatest ability to absorb radiant energy through photoelectric absorption? A. bone B. fat C. air D. muscle - ANSWER A. bone Which of the following is MOST important in determining patient radiation dose during radiography?