Half-value layer (mm) to per millimeter
Type a value in HVL mm to get it in mm⁻¹ instantly.
0.01136mm⁻¹
That's about the same as concrete (Co-60). Cutting the beam a thousandfold takes about 60.79 cm of it.
Convert the other way: mm⁻¹ to HVL mm
What it means
How strong a shield is that?
Narrow-beam attenuation. Real shields let through more because of scattered radiation (build-up); design shielding to the relevant standards.
The math
How to convert HVL mm to mm⁻¹
HVL = ln 2 ÷ μ = 0.693 ÷ μ; TVL = ln 10 ÷ μ = 2.303 ÷ μ.
Example: 61 HVL mm = 0.0113631 mm⁻¹.
Every unit
That shielding in every unit
Tables
HVL mm to mm⁻¹ conversion table
| HVL mm | mm⁻¹ |
|---|---|
| 0.1 HVL mm | 6.93147 mm⁻¹ |
| 0.25 HVL mm | 2.77259 mm⁻¹ |
| 0.5 HVL mm | 1.38629 mm⁻¹ |
| 1 HVL mm | 0.693147 mm⁻¹ |
| 2.5 HVL mm | 0.277259 mm⁻¹ |
| 4.8 HVL mm | 0.144406 mm⁻¹ |
| 10 HVL mm | 0.0693147 mm⁻¹ |
| 12 HVL mm | 0.0577623 mm⁻¹ |
| 20 HVL mm | 0.0346574 mm⁻¹ |
| 48 HVL mm | 0.0144406 mm⁻¹ |
| 61 HVL mm | 0.0113631 mm⁻¹ |
| 100 HVL mm | 0.00693147 mm⁻¹ |
| 110 HVL mm | 0.00630134 mm⁻¹ |
mm⁻¹ to HVL mm conversion table
| mm⁻¹ | HVL mm |
|---|---|
| 0.0063 mm⁻¹ | 110.023 HVL mm |
| 0.00693 mm⁻¹ | 100.021 HVL mm |
| 0.0114 mm⁻¹ | 60.8024 HVL mm |
| 0.0144 mm⁻¹ | 48.1352 HVL mm |
| 0.0347 mm⁻¹ | 19.9754 HVL mm |
| 0.0578 mm⁻¹ | 11.9922 HVL mm |
| 0.0693 mm⁻¹ | 10.0021 HVL mm |
| 0.144 mm⁻¹ | 4.81352 HVL mm |
| 0.277 mm⁻¹ | 2.50234 HVL mm |
| 0.693 mm⁻¹ | 1.00021 HVL mm |
| 1.39 mm⁻¹ | 0.498667 HVL mm |
| 2.77 mm⁻¹ | 0.250234 HVL mm |
| 6.93 mm⁻¹ | 0.100021 HVL mm |
Quick answers
Quick answers
- How many mm⁻¹ is 1 HVL mm?
- 1 HVL mm is 0.693147 mm⁻¹.
- How many mm⁻¹ is 10 HVL mm?
- 10 HVL mm is 0.0693147 mm⁻¹.
- How many mm⁻¹ is 61 HVL mm?
- 61 HVL mm is 0.0113631 mm⁻¹.
The units
About these units
Half-value layer (mm) (HVL mm)
Thickness that halves the beam, in mm.
Per millimeter (mm⁻¹)
Linear attenuation coefficient in mm⁻¹.
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