Dose Distribution Visualization
100% isodose
50% isodose
20% isodose
10% isodose
5% isodose
Source Parameters
Source Properties
Radionuclide:
I-125
Half-life:
59.4 days
Active Length (L):
0.35 cm
Dose Rate Constant (Λ):
0.965 cGy·h⁻¹·U⁻¹
Point Dose Calculation
Click on the visualization to calculate dose at any point
Distance (r):
1.00 cm
Angle (θ):
90.0°
GL(r,θ):
1.0000
GL(r₀,θ₀):
1.0000
gL(r):
1.000
F(r,θ):
1.000
Dose Rate:
0.965 cGy/h
TG-43U1 Formula
Ḋ(r,θ) = SK · Λ · [GL(r,θ) / GL(r₀,θ₀)] · gL(r) · F(r,θ)
Reference: r₀ = 1 cm, θ₀ = 90°
Point source: GP = 1/r²
Line source: GL = β / (L·r·sin θ)
where β = subtended angle (radians)