TERM: 3RD TERM
WEEK: 5
CLASS: Junior Secondary School 3
AGE: 14 years
DURATION: 40 minutes each for 2 periods
DATE:
SUBJECT: Basic Science
TOPIC: Radioactivity
SPECIFIC OBJECTIVES: At the end of the lesson, the learners should be able to
- ) List radioactive detectors
- ) State the uses of radioactivity
INSTRUCTIONAL TECHNIQUES: Identification, explanation, questions and answers, demonstration, story-telling, videos from source
INSTRUCTIONAL MATERIALS: Recommended Basic Science textbooks for Junior Secondary School 3
INSTRUCTIONAL PROCEDURES: PERIOD 1-2:
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PRESENTATION
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TEACHER’S ACTIVITY
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PUPIL’S ACTIVITY
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STEP 1
Review
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The teacher revises the previous lesson.
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Learners pay attention
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STEP 2
Introduction
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He lists some radioactive detectors
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Learners pay attention and participate
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STEP 3
Explanation
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He further outlines the uses of radioactivity
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Learners pay attention and participate
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STEP 4
NOTE TAKING
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The teacher writes a short note on the board for the learners to copy
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The learners copy the note from the board
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NOTE
RADIOACTIVITY
Radioactive Detectors
- Geiger-Muller Counter: Detects alpha, beta, and gamma radiation.
- Scintillation Counter: Uses a scintillating material to emit flashes of light when radiation interacts with it, which are then counted.
- Ionization Chamber: Measures ionization caused by radiation in a gas.
- Cloud Chamber: Allows visualization of the paths of radiation particles in a vapor-saturated environment.
Uses of Radioactivity
- Medical Uses:
- Radiation therapy to treat cancers (e.g., using Cobalt-60).
- Diagnostic imaging (e.g., PET scans using radioactive tracers).
- Industrial Uses:
- Radiography for inspecting materials and structures.
- Sterilizing medical equipment with gamma radiation.
- Energy Production:
- Nuclear power generation using uranium or plutonium.
- Research:
- Studying chemical reactions and processes using isotopes.
- Tracing the movement of substances in biological systems.
- Archaeological Dating:
- Carbon-14 dating for determining the age of ancient artifacts and fossils.
- Environmental Applications:
- Tracing pollutants in air, water, and soil.
EVALUATION:
- Explain how a Geiger-Muller counter detects radiation, and what types of radiation it is capable of measuring.
- Compare and contrast the use of a scintillation counter and an ionization chamber in detecting radiation.
- List and explain at least three medical applications of radioactivity, including how specific radioactive elements or isotopes are used in each.
- How does nuclear power generation utilize radioactive elements like uranium or plutonium, and what role does radioactivity play in energy production?
- Discuss the importance of radioactivity in archaeological dating, particularly the use of Carbon-14, and explain how it helps determine the age of artifacts and fossils.
CLASSWORK: As in evaluation
CONCLUSION: The teacher marks their books and commends them positively
