Consider a technologist exposed to a dose rate of 3 mGy/hour at a distance of 7 feet from the x-ray source. What is the total absorbed dose to the worker during a 1 hour period if they step back to 11 feet from the source?

Which of the following statements describes the relationship between source-to-image distance (SID) and receptor exposure?

Adding filtration in the path of the beam results in the x-ray emission spectrum:

If the patient dose is 1 mGy at a 72 inch SID, what is the patient dose at a 40 inch SID using the same technical factors?

Which one of these would produce the least magnification?

Which of the following formulas is used to determine the magnification factor?

If the x-ray tube is moved closer to the image receptor, the radiation intensity at the IR:

PART 2: Introduction to Diversity Indices (Measuring Diversity)   Using the table, calculate the total abundance in the community and the Pi value for each species. Next, calculate the natural log of Pi for each species (ln(Pi)) and then multiply the two columns to calculate Pi * ln(Pi). Limit your numbers to three decimal places. The Wildebeest has been given as an example for you.  Create your own table by clicking “Insert” and “Table” (You can also copy and paste the empty table and edit it). You are allowed to use a scientific calculator to solve the mathematical problems.  Pi = species abundance/total abundance in the community ln = natural log Species Species Abundance Pi  ln(Pi)  Pi * ln(Pi) Wildebeest 2 0.027 -3.624 -0.097 Elephant 3                                                 Zebra 5                                                 Hippo 1                                                 Impala 6                                                 Lion 3                                                 Baboon 17                                                 Warbler 22                                                 Crane 16                                                 Total abundance in the community   Start here                                                   H                

Which of the following radiographic images of the skull is likely to have the greatest amount of shape distortion?

If an initial exposure is made using 800 mA, 0.02 sec, 16 mAs, 70 kVp, 58” SID, 4” OID, 5:1 grid ratio, 0.2 mm focal spot and 3.0 mm of filtration, with a 14 x 17 in field size, and the technologist changes to the 0.3 mm focal spot for a second exposure without changing any other factors, what differences would you expect to see in the second exposure?1) Increased IR exposure2) Decreased IR exposure3) Increased contrast4) Decreased contrast5) Increased spatial resolution6) Decreased spatial resolution7) Increased distortion8) Decreased distortion