Radioactivity

Half Life of a radioactive substance – The time taken for an amount of radioactive isotope (radioisotope) to decay to half of its original amount.

Example – If I had 100g of Carbon, how long will it take to just have 500g?

TIME (YEARS)

AMOUNT (g)

10

1000

5700

500

11400

250

Answer = 5700 years

OR

Types of Radiation:

Alpha decay:

-formed when there are too many protons and neutrons.

-if the element has over 85 protons – it’s alpha decay.

Beta decay:

-If it has under 20 protons and the number of neutrons, it’s stable.

-Otherwise, beta decay is formed.

Gamma decay:

-Gamma decay accompanies other forms of radiation.

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Note on Term 2 Science, created by Jaida B on 05/07/2017.