This subunit consists of 5 activities. The order and flow of activities are presented below. The activities are created in this way that they offer a complete learning cycle.
| File ID | Activity Name | Inquiry Type | E-emphasis |
| XVI.3.1 | α, β, and γ | Guided discovery Bounded inquiry |
1. Engagement 2. Exploration 3. Explanation 4. Elaboration/ Evaluation |
| XVI.3.2 | Radioactive decay | Guided inquiry Bounded inquiry |
1. Engagement 2. Exploration 3. Explanation 4. Elaboration/ Evaluation |
| XVI.3.3 | Tracing substances in the human body | Guided discovery | 1. Engagement 2. Exploration 3. Explanation 4. Elaboration 5. Evaluation |
| XVI.3.4 | Radiation exposure | Guided inquiry | 1. Engagement 2. Exploration 3. Explanation 4. Elaboration 5. Evaluation |
| XVI.3.5 | Radiation protection |
Bounded inquiry Open inquiry (5) |
1. Engagement 2. Exploration 3. Explanation 4. Elaboration 5. Evaluation |