SOLUTIONS TO EXERCISES, LESSON 1

1. Wilhelm Konrad Roentgen (para 1-2)

2. Crookes (para 1-2)

3. denote an unknown factor (para 1-2)

4. roentgen ray (para 1-3c)

5. natural background man-made radiation (para 1-4a)

6. Any four:
     medical and dental radiographs
     occupational exposure
     fallout from weapons testing
     television sets
     certain watch dials, clocks and meters (para 1-4c)

7. cosmic
     earth
     internal (para 1-4b)

8. a. control panel
     b. tube head
     c. flexible extension arm (para 1-6)

9. technician and patient (para 1-8)

10. Scattered/secondary radiation (para 1-8)

11. aluminum filter or disk (para 1-9b)

12. The collimator restricts the x-ray beam to the desired size. (para 1-9c)

13. dosimeter (para 1-10b(1))

14. DD Form 1141 (para 1-10b(1))

15. An accumulated whole body dose, in rems, of five times the number of years beyond age 18
and a maximum of 3 rems in any 3-month period is permitted. (para 1-10b(2))

16. 1/16 inch lead (para 1-10b(3))

17. exposure time (para 1-11)

18. The technician increases the milliamperes. (This action increases the number of electrons at the cathode filament.
When more electrons strike the anode (tungsten target), a greater number of x-rays (photons) are produced.) (para 1-11b)

19. Increased voltage provides less contrast (more shades of gray)a

      Decreased voltage provides more contrast (fewer shades of gray, more black and white shades) (para 1-11a)