To determine which types of radiation correspond to each number in the table, we need to analyze the properties of beta, alpha, and gamma radiations and how they interact with different materials.
Given the table summarizing the materials stopping the radiations:
| Material | 1 | 2 | 3 |
|----------------|----------|----------|----------|
| Lead | Stopped | Stopped | Stopped |
| Cloth | Not stopped | Stopped | Stopped |
| Aluminum foil | Not stopped | Stopped | Stopped |
| Wood | Not stopped | Stopped | Stopped |
| Paper | Not stopped | Stopped | Not stopped |
| Thick concrete | Stopped | Stopped | Stopped |
### Analyzing the materials:
1. Beta Radiation:
- Lead stops beta radiation.
- Cloth, aluminum foil, and wood do not stop beta radiation.
- Paper does not stop beta radiation.
- Thick concrete stops beta radiation.
2. Alpha Radiation:
- Lead stops alpha radiation.
- Cloth, aluminum foil, wood, and paper stop alpha radiation.
- Thick concrete stops alpha radiation.
3. Gamma Radiation:
- Lead stops gamma radiation.
- Cloth, aluminum foil, wood, and paper do not stop gamma radiation adequately.
- Thick concrete stops gamma radiation.
### Matching properties with the table:
- For Material 1:
- Stopped by Lead, not stopped by Cloth, Aluminum foil, Wood, or Paper, but stopped by Thick concrete.
- This matches the properties of beta radiation.
- For Material 2:
- Stopped by Lead, Cloth, Aluminum foil, Wood, Paper, and Thick concrete.
- This matches the properties of alpha radiation.
- For Material 3:
- Stopped by Lead and Thick concrete, but not by Paper.
- This matches the properties of gamma radiation.
### Conclusion:
Based on the analysis, the numbered types of radiation are:
1. 1 = Beta radiation.
2. 2 = Alpha radiation.
3. 3 = Gamma radiation.
Thus, the answer is:
[tex]\[ \text{1 = Beta; 2 = Alpha; 3 = Gamma} \][/tex]
