Nuclear energy links what radiation is, how a source weakens, how power is generated and how risks are controlled. The same few ideas, penetration, half-life and energy chains, appear in every lesson.
This cluster is part of the SPM Science learning guide. Each lesson has an original worked example and a self-check.
What does this area cover?
It starts with telling alpha, beta and gamma apart. It moves to reading decay data, then compares how nuclear and other power stations work, and ends with the controls that keep exposure low.
How do the parts connect?
Half-life is the thread. A source decays by half-lives, the time scale decides how long waste stays active, which is why safety controls matter.
| Lesson | Skill | Link to the next |
|---|---|---|
| Radiation types | Compare penetration | Sets up shielding |
| Half-life data | Count halvings | Explains waste time scales |
| Energy-generation principles | Compare chains | Raises the safety question |
| Safety controls | Time, distance, shielding | Closes the loop |
A short orienting example
A source has an activity of 400 counts per minute and a half-life of 5 days. After 15 days, which is 3 half-lives, the activity falls 400 → 200 → 100 → 50 counts per minute.
If the source emits gamma radiation, only thick lead or concrete will cut the count strongly. So both decay and shielding shape how it is handled.
Who should start where?
If the three radiation types blur, begin with the first lesson. If you can halve but lose marks on the wording, go to the second. When you are ready to check everything, use the nuclear energy practice set.
The graph evidence and fair-comparison lab gives extra data practice. To work through the cluster with a teacher, see online one-to-one Science tuition.