SUBTOPIC : UNDERSTANDING THE USES OF RADIOISOTOPES

• Name : Nurul Syazwani Izzati Bt Khairi• Class : 409/509• Physics Teacher : Encik Abdul Hamid

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

Also called as RADIOACTIVE ISOTOPES

Some exists NATURALLY such as …

I. Hydrogen

II. Oxygen

III. Potassium

Others produces ARTIFICIALLY by

TRANSMUTATIONS in Nuclear Reactor such

as …I. Sodium

II. Iodine

III. Carbon

Medicine

Medicine

Industries AgricultureAgriculture Archaeology

• Enhance the efficient and sustainable use of soil-water-

nutrient resources

• Minimize effects of soil erosion and degradation

• Quantify the Biological Nitrogen Fixation

1. Which of the following radioisotopes is used in smoke detectors ?

A.Sodium-24B.Americium-241C. Cobalt-60D. Phosphorus-32

B. Americium-241

2. Understanding uses of radioactivity, briefly describe one of its use inMedicine , 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

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