1. SUBTOPIC : UNDERSTANDING THE
USES OF RADIOISOTOPES
• Name : Nurul Syazwani Izzati Bt Khairi
• Class : 409/509
• Physics Teacher : Encik Abdul Hamid

4. 
Atoms of an element with the SAME NUMBER OF PROTONS but
DIFFERENT NUMBER OF NEUTRONS .
 Have SAME CHEMICAL PROPERTIES because ….
• SAME number of electrons
 Have DIFFERENT PHYSICAL PROPERTIES because ….
• DIFFERENT number of neutrons

6.  Also called as RADIOACTIVE ISOTOPES

Some exists NATURALLY such as …
I. Hydrogen
II. Oxygen
III. Potassium
 Others produces ARTIFICIALLY by
TRANSMUTATIONS in Nuclear
I. Sodium
II. Iodine
III. Carbon
Reactor such as …

9. Medicine
Medicine
Industries
Agriculture
Agriculture
Archaeology

19. • Enhance the efficient and sustainable use of soil-water-nutrient
resources
• Minimize effects of soil erosion and degradation
• Quantify the Biological Nitrogen Fixation

25. 1. Which of the following radioisotopes
is used in smoke detectors ?
A. Sodium-24
B. Americium-241
C. Cobalt-60
D. Phosphorus-32
B. Americium-241

26. 2. Understanding uses of radioactivity, briefly describe one of its
use in
Medicine , agriculture and industries .
 Medicines
Iodine -131 is used to check the function of the
thyroid gland.
The patient is given an injection of iodine -131 to
act as a tracer . The activity of the iodine -131 is
detected and monitored at the throat of the patient.
 Agriculture
To control pests . Gamma rays can kill bacteria . Gamma rays
is used to cause infertility of agriculture pests and insects.
 Industries
To determine water leakage in underground pipe using
sodium-24

27. 3. Two properties of sodium-24 which
make it a suitable tracer to detect pipe
leakage ?
o It decays by emitting gamma rays which can
penetrate the ground and underground pipes
o Its half life of 15 hours enables it to decay
to a level which is harmless in short time