1.Test method
1) Place the standard aluminum plate group in the X-ray uniform radiation field that has been absolutely measured by the air kerma standard, measure the absorbed dose respectively, and obtain the aluminum plate thickness and absorption measurement calibration curve
2) Place the sample to be tested in an X-ray uniform radiation field that has been absolutely measured by the air kerma standard to obtain the absorbed dose, and use the internal difference method to obtain the aluminum equivalent of the sample based on the absorption measurement curve.
2.Test conditions
Tube voltage 100KV, tube current 400mA
3.Test samples
FutureFOAM C-52 (FutureFOAM C：A closed-cell rigid foam material based on PMI, halogen-free, with a foam pore size of 0.1-0.4 mm, which is small and uniform.Density: 52kg/m3)
4.Test results
| Al-Plate Thickness（mm） | Measure （mGy） | Sample Thicness （mm） | Measure （mGy） | Equivalent Thickness （mm） |
| 0 | 17.02 | 20 | 16.74 | 0.066 |
| 0.1 | 16.59 | 30 | 16.45 | 0.143 |
| 0.2 | 16.21 | 50 | 16.21 | 0.209 |
| 0.3 | 15.87 | / | ||
| 0.4 | 15.43 | / |
