atomic structure and decay

Question 1

how do T(eff), T(b), and T(p) relate?

Answer 1

T(eff) is the shortest

1/T(eff) = 1/T(p) + 1/T(b)

Question 2

T(eff) definition

Answer 2

T required to reduce the radioactivity level of an organ or the whole body to exactly 1/2 its original value due to both elimination and decay.

Question 3

B- decay is accompanied by a

Answer 3

anti-neutrino

Question 4

minimum E for triplet production

Answer 4

2.04 MeV

Question 5

Average life of radioisotope

Answer 5

1.44*t1/2

Question 6

Total brachy dose calculation

Answer 6

D = initial dose rate * mean life
D = D0 * 1.44 * t1/2

Question 7

Cs-137 half life

Answer 7

30 years

Question 8

Pd 103 haf life

Answer 8

17 days

Question 9

Activity equation

Answer 9

A = Ao * (1/2) ^(t / t1/2)

Question 10

Y- 90 energy

Answer 10

.93 MeV

Question 11

Y-90 half life

Answer 11

2.67 days

Question 12

What is a magnetron?

Answer 12

a radiofrequency generating component of a linac

Question 13

What is a klystron?

Answer 13

radiofrequency amplification component

Question 14

Intensity is proportional to ____, _____, _____, and _____.

Answer 14

Z
kVp^2 (greatest factor!)
mA
1/d^2

Question 15

HDR sources must be calibrated to ____% of manufacturer’s certificate

Answer 15

3%

Question 16

Maximum deviation between dwell positions intended and measured?

Answer 16

1 mm

Question 17

What calibrates radioactive seeds? How frequently is this needed?

Answer 17

Well chamber, annually

Question 18

Isotopes made in a nuclear reactor (waste)

Answer 18

Cs-137, Sr-90, I-131, Co-60

Question 19

Isotopes made in a cyclotron

Answer 19

F-18

Question 20

sealed brachy sources are leak tested how often?

Answer 20

q 6 months

Question 21

How often do light field/radiation field checks have to be done?

Answer 21

monthly

Question 22

How often do X-ray output constancy checks need to be done?

Answer 22

daily, must be within 2%