◈ Which of the following is an example of sparsely ionizing radiation? 

A. 2 MeV electrons 

B. 2 MeV gamma rays 

C. 2 MeV X-rays 

D. All of the above 

E. None of the above 

◈ Which type of radiation-induced DNA damage is most important for cell killing caused by exposure to ionizing radiation? 

A. Base damage 

B. DNA double-strand break 

C. DNA single-strand break 

D. DNA-protein crosslink 

E. DNA-DNA inter-strand crosslink 

◈ Which of the following aberrations occur after DNA replication? 

A. Chromosome 

B. Chromatid 

◈ Which of the following statements concerning chromosome aberrations is FALSE? 

A. Ring chromosomes are induced as a linear function of dose for high LET radiation 

B. The induction of radiation-induced terminal deletions is a linear function of dose 

C. An anaphase bridge is a chromatid aberration 

D. For a given dose of X-rays, the yield of dicentrics decreases with decreasing dose rate 

E. Symmetrical translocations are unstable chromosome aberrations 

◈ The minimum whole body radiation dose that can be detected through the measurement of dicentric chromosomes in peripheral blood lymphocytes is approximately: 

A. 0.0025 Gy 

B. 0. 025 Gy 

C. 0.25 Gy 

D. 2.5 Gy 

E. 5 Gy