Half-value layer (cm) to tenth-value layer (cm)
Type a value in HVL cm to get it in TVL cm instantly.
20.26TVL cm
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: TVL cm to HVL cm
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 cm to TVL cm
HVL = ln 2 ÷ μ = 0.693 ÷ μ; TVL = ln 10 ÷ μ = 2.303 ÷ μ.
Example: 6.1 HVL cm = 20.2638 TVL cm.
Every unit
That shielding in every unit
Tables
HVL cm to TVL cm conversion table
| HVL cm | TVL cm |
|---|---|
| 0.01 HVL cm | 0.0332193 TVL cm |
| 0.025 HVL cm | 0.0830482 TVL cm |
| 0.05 HVL cm | 0.166096 TVL cm |
| 0.1 HVL cm | 0.332193 TVL cm |
| 0.25 HVL cm | 0.830482 TVL cm |
| 0.48 HVL cm | 1.59453 TVL cm |
| 1 HVL cm | 3.32193 TVL cm |
| 1.2 HVL cm | 3.98631 TVL cm |
| 2 HVL cm | 6.64386 TVL cm |
| 4.8 HVL cm | 15.9453 TVL cm |
| 6.1 HVL cm | 20.2638 TVL cm |
| 10 HVL cm | 33.2193 TVL cm |
| 11 HVL cm | 36.5412 TVL cm |
TVL cm to HVL cm conversion table
| TVL cm | HVL cm |
|---|---|
| 0.0332 TVL cm | 0.0099942 HVL cm |
| 0.083 TVL cm | 0.0249855 HVL cm |
| 0.166 TVL cm | 0.049971 HVL cm |
| 0.332 TVL cm | 0.099942 HVL cm |
| 0.83 TVL cm | 0.249855 HVL cm |
| 1.59 TVL cm | 0.478638 HVL cm |
| 3.32 TVL cm | 0.99942 HVL cm |
| 3.99 TVL cm | 1.20111 HVL cm |
| 6.64 TVL cm | 1.99884 HVL cm |
| 15.9 TVL cm | 4.78638 HVL cm |
| 20.3 TVL cm | 6.11091 HVL cm |
| 33.2 TVL cm | 9.9942 HVL cm |
| 36.5 TVL cm | 10.9876 HVL cm |
Quick answers
Quick answers
- How many TVL cm is 1 HVL cm?
- 1 HVL cm is 3.32193 TVL cm.
- How many TVL cm is 10 HVL cm?
- 10 HVL cm is 33.2193 TVL cm.
- How many TVL cm is 6.1 HVL cm?
- 6.1 HVL cm is 20.2638 TVL cm.
The units
About these units
Half-value layer (cm) (HVL cm)
Thickness that halves the beam, in cm.
Tenth-value layer (cm) (TVL cm)
Thickness that cuts the beam to a tenth.
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