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Ian page 59 RADIOACTIVITY. Objective. Main Ideas Radioactivity Half-life Radioactive Decay Marie Curie. Describe and apply radioactivity using notes, video, and an interactive Gizmo Lab.

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Ian page 59 radioactivity
Ian page 59RADIOACTIVITY

Objective

  • Main Ideas

  • Radioactivity

  • Half-life

  • Radioactive Decay

  • Marie Curie

Describe and apply radioactivity using notes, video, and an interactive Gizmo Lab.


I. Radioactivity - Process where the nucleus of an atom releases energy and particles Neutrons and/or Protons.

A. Marie Curie (1867-1934) Isolated radioactive elements.

(Radium, Polonium, Thorium)

B. Heavier elements and most Isotopes tend to be radioactive.


C. Radioactive uses

1. Medical: Killing tumors, x-rays, MRI’s

2. Dating (Not your Girlfriend!)

to find out the age of substances (C14, O18)


D. Geiger Counter – used to detect radioactivity.


Radioactive Decay

100

50

Original Isotope Remaining (%)

25

12.5

4

0

1

2

3

Number of half-lives

= new element

= original element

E. Radioactive Decay = Time required for Half of a particular element to change to a more stable atom.

**THIS IS KNOWN AS HALF-LIFE**


1. Uranium half-life = 4.47 billion years!

2. Carbon-14 eventually decay’s into “Normal” Carbon-12.


Ian page 58
IAN PAGE 58

Marie Curie Biography

Ariticle


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