TABLE 5.
Dose Rates Comparing
99m
Tc Vs.
223
Ra Derived from Exposure Rate Constants (μSv/h per MBq) (
31
)
Distance from point source
99m
Tc
223
Ra
223
Ra + progeny
1 m
0.02
∼0.02
0.047
10 cm
2
∼2
4.7
1 cm
200
∼200
470