WILL GO Cinges, some parent or daughter atoms may escape. Parent Element
(1/2)
U-238
U-235
Thorium 232
Potassium K-40
Daughter
Element
Lead 206
Lead 207
Lend 208
Argon 40
Calcium 40
Strontium 87
Nitrogen 14
Types of Radioactive Isotopes Used for Dating
Half Life Lower Upper Examples of Materials Containing Isotopes
Range Range (10x+y)
4.5 billion 10 million 45 billion
ignoous & metamorphic rocks
710 million 1 million 7.1 biller igneous & metamorphic rocks
14 billion 50 million
igneous & metamorphic rocks
1.3 billion 500,000
ignoous & metamorphic rocks
47 billion 100 million
igneous & metamorphic rocks
5.730 years
plant & animal tissue, ice
Rubidium 87
Carbon 14
200 year
I FI in the upper range for each isotope by multiplying the half life by 10.
II. Questions
1. Elements decay if they have too many
or if the
is too large.
PT