Radionuclides

Question 1

226Ra

Answer 1

Half life: 1600 years
Photon energy MeV: 0.83
HVL (mm lead): 12-8
Exposure Rate Constant: 8.25

Question 2

222Rn

Answer 2

Half life: 3.8 days
Photon energy MeV: 0.83
HVL (mm lead): 12
Exposure Rate Constant: 10.15

Question 3

60Co

Answer 3

Half life: 5.26 years
Photon energy MeV: 1.17 + 1.33 (1.25 avg)
HVL (mm lead): 11
Exposure Rate Constant: 13

Question 4

137Cs

Answer 4

Half life: 30 years
Photon energy MeV: 0.662
HVL (mm lead): 5.5
Exposure Rate Constant: 3.26

Question 5

192Ir

Answer 5

Half life: 74.2 days
Photon energy MeV: 0.38
HVL (mm lead): 2.5-3
Exposure Rate Constant: 4.69

Question 6

198Au

Answer 6

Half life: 2.7 days
Photon energy MeV: 0.412
HVL (mm lead): 2.5
Exposure Rate Constant: 2.38

Question 7

125I

Answer 7

Half life: 59 days
Photon energy MeV: 0.028
HVL (mm lead): 0.025
Exposure Rate Constant: 1.46

decays by electron capture

Question 8

103Pd

Answer 8

Half life: 17 days
Photon energy MeV: 0.021
HVL (mm lead): 0.008
Exposure Rate Constant: 1.48

decays by electron capture

Question 9

90Sr

Answer 9

Half life: 28.8 years

Photon energy MeV: 0.546 beta

Question 10

90Y

Answer 10

Half life: 2.67 days

Photon energy MeV: 0.94 avg/2.27 max beta

Question 11

99mTc

Answer 11

Half life: 6 hours
Photon energy MeV: 0.14
HVL (mm lead): 0.27

Question 12

18F

Answer 12

Half life: 2 hours

Question 13

131I

Answer 13

Half life: 8 days
Photon energy MeV: 0.190
HVL (mm lead): 3.3

Question 14

32P

Answer 14

Half life: 14.3 days

Photon energy MeV: 0.693 avg / 1.71 max (beta)