Exam 2 II Flashcards Preview

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Flashcards in Exam 2 II Deck (44):
1

Cerrobend

Bismuth, Lead, Tin, Cadmium

2

melting point of cerrobend

70˚F

3

Blocks should be at least ____ far from patient

15 cm

4

How do you determine the thickness of cerrobend needed?

Multiply the amount of lead needed by 1.21

5

Half beam blocking

Lower border as the central axis, avoid divergence from another treatment field.

6

physical wedges

Mostly made from lead, must be at least 15 cm from the patient

7

Compensators

same effect as wedge but for more irregularly shaped pt. not used as often

8

Warnings

For people

9

Cautions

For equipment

10

Different issues

varian has an emergency pendant, press beam off, pull the key, emergency off, get the patient off, always document number of MU's given, always remove the key if you you leave the machine

11

Criteria of a medical event

1. total dose delivered differs from prescribed dose by more than 20%
2. Wrong patient
3. Fractionated dose differs by more than 50%
4. Wrong radioactive source or administration pathway
5. wrong patient
6. A leaked sealed source

12

Sets dose limits for radiation

NCRP

13

Counsels the procession and use of radioactive materials

NRC

14

Exposure vs. Absorbed dose

Exposure = the number of ionizations in the air and the the absorbed dose = absorbed dose by a medium

15

radiation worker annual exposure limits

Whole body = 5 rem
Extremity/skin = 50 rem
Eye = 15 rem

16

Non radiation worker exposure limits

.5 rem

17

Who maintains all exposure documentation?

RSO

18

Controlled areas

-Under supervision of the RSO
-Possible dose greater than background radiation exposure
-Access, occupancy and working conditions are controlled
-dose equivalent limit = .1 rem

19

Radioactive material

any amount of radioactivity in the area

20

radioactive area

5-100 mrem / hour at 30 cm, on our walls and doors

21

high radiation area

>100 mrem, outside of brachytherapy or the hot lab

22

very high radiation area

>500 rads, at nuclear power plants

23

uncontrolled areas

have a dose equivalent of .01 rem/week

24

SSN

T2/T3

25

Xiphoid process

T10-T12

26

Carina

T4/T5

27

Trachea

C6-T4

28

Transphyloric plane

indicates the hilum of the kidneys, half way in the costal margin

29

Bottom of scapula

T7

30

SET

Spinal cord -> Esophagus -> Trachea

31

Diaphragm

Located right below the lungs

32

Spinal cord

47Gy, melts necrosis

33

Lung

17.5 Gy, pneumonitis

34

Heart

40 Gy, pericarditis

35

Esophagus

55 Gy, stricture, perforation

36

Stomach

50 Gy, ulceration, perforation

37

Brachial plexus

60 Gy, nerve damage

38

Bone marrow

3 Gy, lethal dose

39

Femoral Head

52 Gy, necrosis

40

Skin

50 Gy, telangiectasia
55 Gy, Necrosis

41

Muscle

60 Gy, myositis

42

Protraction

The period over which radiation is delivered

43

MSDS

Medical safety and data sheet

44

Monthly dose equivalent limit for fetus

.5 mSv