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Medical Dosimetry Certification Prep Revision
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Medical Dosimetry Certification is a professional credential, primarily administered by the Medical Dosimetrist Certification Board (MDCB), that validates a practitioner's expertise in planning cancer radiation treatments. It requires passing a rigorous exam after completing an accredited education program, ensuring competency in dose calculations, treatment planning, and safety. Role of a Certified Medical Dosimetrist As part of the radiation oncology team (alongside doctors and physicists), they determine the best beam arrangements and radiation doses to destroy tumors while sparing... Show more
Medical Dosimetry Certification Prep Revision
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25 Questions

1. What four things are needed for radiation therapy treatment planning?

2. lateral brain fields and a posterior spinal field are best matched by turning the_____

3. One gray is equivalent to

4. protection instruments such as survey monitors must be calibrated in terms of______

5. The weekly maximum dose equivalent rate in controlled areas is =

6. per ICRU 50, what is the desired dose uniformity in the PTV?

7. Collimator Scatter Factor (Sc), provides the ______

8. The scatter dose that any given point in a phantom or patient can be determined_______

9. photoelectric effect involves______

10. in a head and neck treatment where the left lateral, right lateral, and anterior fields are commonly used:

11. The virtual source of a clinical electron being always lies at_____

12. The air kerma rate (AKR) at 1 m from a 1 mg Ra source (0.5 mm Pt filtration) is____

13. if the shutter timer error is negative, to set the treatment time on the unit

14. The unit for dose equivalent, H, is expressed in_______

15. The focal spot of a KV X-ray therapy tube is about_____

16. in the case of brachytherapy sources_____

17. TPS computed dose can be checked by_____
manual dose calculation for specific cases

18. A patient is to be treated with an 8 MEV electron beam. A lead cut out is used inside the applicator to shape the field. what is the thickness of the cutout required to reduce the dose below the cutout region to less than 5% of the useful beam?

19. is the KV x-ray beam used in radiation therapy monoenergetic or does it have spectral distribution?

20. dose build up in the build-up region is

21. The air kerma rate of a 60 cobalt beam at 1 m from the source for a 10 cm x 10 cm field is 100 cGy/min. the output factor for a 6 cm x 6 cm field is 0.92. what is the output factor for the 6 cm x 6 cm field in cGy/min?

22. skin reaction to radiation is a______effect

23. 1 Curie is equal to how many becquerel

24. 60Co is a _____ emitter

25. The shoulder portion of the cell survival curve____