To determine the types of radiation, we'll analyze the table and the ability of different materials to stop each type of radiation.
1. Lead and Thick Concrete:
Both lead and thick concrete can stop all types of radiation. This information, however, does not help distinguish between the types of radiation because these materials stop everything.
2. Cloth, Aluminum Foil, and Wood:
These materials stop the second and third types of radiation but not the first. This indicates that the first type of radiation is the weakest in terms of penetration because these relatively thin materials cannot stop it.
3. Paper:
Paper stops only the second type of radiation and does not stop the first and the third. This highlights that the second type of radiation is less penetrating than the first and the third.
From the penetration abilities, we know the following characteristics of the three types of radiation:
- Beta particles (β) are not very penetrating and can be stopped by materials like cloth and aluminum foil.
- Alpha particles (α) are even less penetrating and can be stopped by paper.
- Gamma rays (γ) are highly penetrating and are stopped only by dense materials like lead or thick concrete.
Given this understanding:
- The first type of radiation in the table, which is not stopped by cloth, aluminum foil, or wood, but may be stopped by heavier materials, corresponds to Beta radiation.
- The second type of radiation in the table is blocked by paper and thus must be Alpha radiation.
- The third type of radiation, which is only stopped by very dense materials like lead and thick concrete, must be Gamma radiation.
Thus, the order of the types of radiation based on the table is:
- [tex]\(1 = \text{Beta}\)[/tex]
- [tex]\(2 = \text{Alpha}\)[/tex]
- [tex]\(3 = \text{Gamma}\)[/tex]
Therefore, the correct answer is:
[tex]\[ \boxed{1 = \text{Beta}; 2 = \text{Alpha}; 3 = \text{Gamma}} \][/tex]
