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The use of added filtration causes the primary x-ray beam to be modified in one or more of the following ways (all other factors unchanged): 1 Increase in the peak energy of the beam2 Increase in the average energy of the beam3 Increase in the number of photons reaching the patient

WHICH OF THE FOLLOWING COMBINATIONS OF NUCLEOTIDES CAN FORM THE RUNGS OF THE DNA MACROMOLECULE? 1 ADENINE AND GUANINE 2 THYMINE AND CYTOSINE 3 ADENINE AND THYMINE 4 GUANINE AND CYTOSINE

According to the National Academy of Science’s BEIR V report, the effects of chronic exposure to low-level, low LET radiation should be regarded as:1 being linear in terms of dose-response2 possessing no known threshold3 an extrapolation from higher dose studies

The essence of target theory is that: 1 There exists within a cell a master molecule2 The lysosome is considered a master molecule3 If a lysosome is destroyed, the cell dies

The unit of biological equivalent radiation dose is the:

Cell division involving somatic cells is called:

A radioactive substance with a half-life of 4.8 hours contains 20 millicuries of activity. How many millicuries will remain after two days?

Based on recommendations contained in NCRP Report =116, the lifetime dose accumulation for a 30 year-old radiation worker should not have exceeded:

A 10 gray dose delivered to the whole body over a short period of time will cause:1 Acute somatic effects2 Non-stochastic effects3 Life-span shortening

TDR5/5R is defined as the total radiation dose delivered in treatments that result in a complication rate of: