Radiometric dating exam questions
Setterfield: Atomic decay rates do not depend on the speed of light.Both are, however, 'children' of the same parent -- the Zero Point Energy.
• t = (ln ((1 1)/1))/1.21x10-4 • t = (ln 2)/1.21x10-4 • t = 5,730 years Some Half Lives • Carbon-14: 5,730 years • Uranium-235: 704 MY • Potassium-40: 1.3 BY • Uranium-238: 4.5 BY • Rubidium-87: 48.8 BY Calculating a Radiometric Date • t = ln (P D)/P (P D = starting material) l • An ash bed just above the Dev.- Carb.
As a result I was using some of my texts to examine the decay of Americium 241 and noted the naturally occurring decay chains for U235, U238 and Th232, as well as the fully decayed chain for Pu241.
My thought is, can the relative natural abundances of these chains' terminal products (Pb208,207, and 206) be used to calculate an initial abundance and time frame for the original atomic abundances of the parent isotopes which could be compared to the predictions of Willie Fowler regarding stellar nucleogenesis processes. Thanks again for all your interesting and informative web postings and work.
Basis of the Technique • Radioactive elements “decay.” Decay occurs as an element changes to another element, e.g. • The parent element is radioactive, the daughter element is stable. • Usually protons and neutrons are emitted by the nucleus. • Carbon-14 is produced by cosmic ray bombardment of Nitrogen-14 in the atmosphere. Doesn’t matter how many atoms started, half will decay.
• Radioactivity occurs when certain elements literally fall apart. Key Term • Half-Life: the amount of time for half the atoms of a radioactive element to decay.