Millimeters of lead to half-value layers
Type a value in mm Pb to get it in HVL instantly.
0.3371HVL
Nothing on our list is smaller: a shielded wall is 8.9× thicker. About 79.16% of the radiation still gets through.
Convert the other way: HVL to mm Pb
What it means
How much gets stopped?
Thicknesses are for a 1 MeV gamma beam. Half-value layers change with photon energy, so a shield that works for one isotope may not for another.
The math
How to convert mm Pb to HVL
To convert millimeters of lead to half-value layers, multiply by 0.11236.
Example: 3 mm Pb × 0.11236 = 0.337079 HVL.
In the other direction, 1 HVL = 8.9 mm Pb.
Every unit
Your shielding in every unit
Tables
mm Pb to HVL conversion table
| mm Pb | HVL |
|---|---|
| 0.5 mm Pb | 0.0561798 HVL |
| 1 mm Pb | 0.11236 HVL |
| 2 mm Pb | 0.224719 HVL |
| 3 mm Pb | 0.337079 HVL |
| 4 mm Pb | 0.449438 HVL |
| 5 mm Pb | 0.561798 HVL |
| 7 mm Pb | 0.786517 HVL |
| 10 mm Pb | 1.1236 HVL |
| 13 mm Pb | 1.46067 HVL |
| 20 mm Pb | 2.24719 HVL |
HVL to mm Pb conversion table
| HVL | mm Pb |
|---|---|
| 0.5 HVL | 4.45 mm Pb |
| 1 HVL | 8.9 mm Pb |
| 2 HVL | 17.8 mm Pb |
| 3 HVL | 26.7 mm Pb |
| 4 HVL | 35.6 mm Pb |
| 5 HVL | 44.5 mm Pb |
| 7 HVL | 62.3 mm Pb |
| 10 HVL | 89 mm Pb |
| 13 HVL | 115.7 mm Pb |
| 20 HVL | 178 mm Pb |
Quick answers
Quick answers
- How many HVL is 1 mm Pb?
- 1 mm Pb is 0.11236 HVL.
- How many HVL is 10 mm Pb?
- 10 mm Pb is 1.1236 HVL.
- How many HVL is 3 mm Pb?
- 3 mm Pb is 0.337079 HVL.
The units
About these units
Millimeters of lead (mm Pb)
Real lead thickness, for a 1 MeV gamma beam.
Half-value layers (HVL)
How many halvings the beam has been through.
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