Beta Dose Calculations • External beta dose rate not in ...
Beta Dose Calculations
? External beta dose rate not in contact with skin
? Point Source, 10 mCi, distance of 0.1 m
D
=
27
rad Ci
- m2 - hr
A d2
D
=
27
rad - m2 Ci - hr
10 mCi
(0.1 m)2
Ci
1000
mCi
=
27
rad hr
1
Beta Dose Calculations
? External dose rate in contact with skin
? 50 cm2 area, 10 mCi Source, Emax = 1 MeV ? What is the skin dose rate with no glove?
? With one glove?
? With two gloves?
D
=
Cf
A a
D
=
Cf
10 50
mCi cm2
=
0.2
mCi cm2
Cf
2
CF (rad-cm2/(hr-mCi))
Healy Curves
10
S = 9
70 m 8
200 m 6
1G = 5
4 30 m
2
2G = 3.5
0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
Maximum Beta Energy (MeV)
3
Beta Dose
Calculations
? Skin dose rate with no glove?
D
=
0.2
mCi cm2
9
rad - cm2 hr - mCi
= 1.8
rad / hr
? Skin dose rate with one glove?
D
=
0.2
mCi cm2
5
rad - cm2 hr - mCi
= 1.0
rad / hr
? Skin dose rate with two gloves?
D
=
0.2
mCi cm2
3.5
rad - cm2 hr - mCi
= 0.7
rad / hr
4
Gamma Dose
Calculations
? External gamma dose rate
? Cs-137, A = 10 mCi, d = 0.1 m
? What are the deep, eye, and shallow dose equivalent rates?
? First calculate exposure rate
X
=
A d2
X
=
10 mCi
(0.1 m)2
Ci 1000 mCi
=
1 Ci m2
5
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