Radioactive Decay some atoms are unstable

Slides:



Advertisements
Similar presentations
Radiometric Dating of Rocks Radioactivity discovered by: Henri Becquerel and Marie and Pierre Curie.
Advertisements

Absolute Dating : A Measure of Time
Geology 12 Presents Methods that didn’t work 1. Bible: 9:00 am Tuesday, Oct 26 th, 4004 BC = beginning of Earth 2. Rate of cooling: Earth from a molten.
Absolute Dating Chapter 7 Lesson 2.
Radiometric Dating Continuation of Journal Entry #5.
ABSOLUTE AGE Absolute Dating Radiometric Dating Half Life Isotope Radioactive decay Carbon 14.
A Fossil.  Any method of measuring the age of an event or object in years.
Table of Contents Titles: Age and Time Page #: 13 Date: 9/12/12.
Absolute Dating.
ABSOLUTE-AGE DATING: A MEASURE OF GEOLOGIC TIME. THINK ABOUT IT… How old is the Earth? Can it be determined? What are some tools or methods that scientists.
Do First Actions: Turn in yesterday’s worksheet 1. List the layers from youngest to oldest.
Absolute Dating.
ABSOLUTE AGE DATING Absolute Age Dating is finding the numerical age of an object Artifacts (rocks or fossils) contain radioactive elements which are.
I. Absolute Dating Absolute dating
Determining Absolute Age
The ABG's (or Alpha, Beta, Gamma) of Radioactivity
The History of Earth Relative Dating Absolute Dating
Ch.3, Sec.3 – Absolute Dating: A Measure of Time
Absolute Dating of Rocks
By stating that rock unit A is older than rock unit B, we are
Chapter 6.3 Absolute Dating
Nuclear Radiation.
EARTH’S HISTORY RADIOMETRIC DATING
Radioactivity.
EARTH’S HISTORY RADIOMETRIC DATING
DO NOW Pick up notes sheets. C. Johannesson.
Absolute Dating.
I. Absolute Dating A. The process of establishing the age of an object (fossil or rock layer) by determining how long it existed.
Absolute Dating Radioactive Dating.
An unstable nucleus releases energy to become more stable
Methods for Estimating the Age of the Earth
Nuclear Energy.
How to calculate it! Average Atomic Mass.
AC Vocabulary Chapter 6 Section 3
How Old is the Earth Anyway?
Lecture 9 Absolute Dating of the Earth
How do we know that the earth is 4.6 billion years old?
Radioactive Decay L.O: SWBAT model how Carbon-14 is used to determine the age of recent fossils.
Notes 11.3: Radioactive Decay & Half-lives
Unit 2 Lesson 3 Absolute Dating
Half Life & Radioactive Decay
Half-Life 7.2.
Half-Life and radiometric dating
Chapter 13 Section 3 Absolute Ages of Rocks.
Absolute Dating.
Absolute Dating.
Absolute Dating.
Geologic Time and Earth History Part 2 – Absolute Age
Nuclear Radiation What happens when an element undergoes radioactive decay? After radioactive decay, the element changes into a different isotope of the.
Absolute Age Dating Absolute Ages Radiometric Dating
Radioactivity.
LESSON 10: Radiometric Dating (ABSOLUTE DATING)
Todays goals… Complete and Submit:
Absolute Dating.
Absolute Dating.
illustrate the concept of half-life.
Notes: Radiometric Dating.
Radiometric Dating.
Absolute Dating.
Absolute Dating Write on right side.
Absolute Age of Rocks Notes
NOTES: GEOLOGIC DATING
Absolute Age Dating.
Relative and Absolute Dating
Radioactive Decay.
Absolute Dating.
Learning Objective: I will be able to explain how we use half lives to determine the age of a rock.
Evolution – Radiometric Dating Evidence
Evolution – Radiometric Dating Evidence
Absolute Dating.
Presentation transcript:

Radioactive Decay some atoms are unstable …occasionally emitting particles from nucleus to become more stable (radioactivity) this changes the atom into a different type of atom (parent element decays to daughter element)

Radioactive Decay cannot predict when a particular atom will decay …BUT, when there are many atoms, the whole group decays in a regular manner if you wait a certain amount of time and 3% decays, then if you wait that same amount of time again, 3% of the remainder will have decayed if you wait for ½ to decay (the half-life), then ½ will decay each half-life

Radioactive Decay half-lives 1 1:1 1/2 (50%) 2 1:3 1/4 (25%) 3 1:7 1/8 1 1:1 1/2 (50%) 2 1:3 1/4 (25%) 3 1:7 1/8 (12.5%) 4 1:15 1/16 (6.25%) 5 1:31 1/32 (3.125%) parent-to- daughter 1:0 fraction of parent 1 (100%) parent daughter

Radioactive Dating we can use this to date things… K-Ar Rb-Sr U235-Pb207 U238-Pb206 Th-Pb Sm-Nd 1) constant rate if we assume some things: 4) how much parent added or taken away 5) how much daughter added 2) how much parent at start 3) how much daughter at start

but something is not right… both biblically & scientifically Radioactive Dating but something is not right… both biblically & scientifically Bible Radiometric Dating earth origin ~6000 yrs old 4,500,000,000 yrs old Flood ~4500 yrs old 600-65,000,000 yrs old human origin 2,000,000 yrs old Biblically…

Radioactive Dating Scientifically… but something is not right… both biblically & scientifically Scientifically… different radiometric methods on same rock  different results U-238/ Pb-206 U-235/ Pb-207 Pb-207/ Pb-206 Dating Method 1936 – 1996 ma. 2176 – 2247 ma. 2435 – 2459 ma. Rock A 1711 – 1863 ma. 2045 – 2111 ma. 2421 – 2447 ma. Rock B

So, what is wrong? Which assumption(s) is(are) wrong? Radioactive Dating So, what is wrong? Which assumption(s) is(are) wrong? 1) constant rate 2) how much parent at start 3) how much daughter at start 4) how much parent added or taken away 5) how much daughter added

has occurred since the creation Radioactive Dating Earth rocks show that billions of years of radiometric decay has occurred since the creation parent/daughter ratios helium (from radiometric decay) in rocks radiation damage fission tracks …including in Flood & post-Flood rocks convincing most people that rocks and fossils are millions and billions of years old …apparently because of modern laws of physics!

has occurred since the creation Radioactive Dating Clues… 1) Earth rocks show that billions of years of radiometric decay has occurred since the creation 2) Earth rocks contain evidence of youth as well! vestiges from fossil ancestors  <1 million years inter-specific hybrids  <<1 million years Flood fossils with C-14 dates 35-50 thousand years helium in creation rocks leaking only ~6000 years

to reconcile much radioactive decay and short ages… Radioactive Dating to reconcile much radioactive decay and short ages… radiometric decay rates were much faster in the past (probably divine intervention in Creation & Flood faster rate in past

Radioactive Dating although there is evidence of much decay, a young earth is reasonable because of discordant dates with different methods evidence of youth of radiometrically ‘old’ rocks God’s inspired eye-witness account (more reliable than circumstantial evidence)