@Helloandgoodbye,
Id like to discuss this with you . lets begin with each "assumption" one at a time
Quote: Assumption 1: Conditions at Time Zero
No geologists were present when most rocks formed, so they cannot test whether the original rocks already contained daughter isotopes alongside their parent radioisotopes.
First error i that we dont "test original rocks".We test original minerals which are molecule crystals that we can test just like a "time rate and distance problem". We know the decay constants of the mother and daughter isotops (THATS REALLY ALL E ARE INTERESTED IN. We measure the half lives of each molecule and crystal. (we test these continuously whil doing the analyses. We also look at the decay paths,
(Single or branched).
There are many instances where we dont observe the initiating conditions of an event and via fairly rotine physics we can calculate the same type of result as the isotope time . In English its presented as thus:
(b)Crystal Age (in annums)(/b) = (1/ bulk decay constant of mother +daughter)
X ln {(decay constant isotope A/Decay constant isotope B ) X ( half life A/half life B)+1} I hve no iea how AIG came up with that "we cant test daughter/parent isotope ratios . Thats BS.
"We Cant determine contamination". We re almost always using single mineral crystals and these are easily kpt clean. We have std degredation "curves" for almost all radioisotopes(with exception of C14 which has to be Cleaned up more vigorously and is usually a target for Creationist contamination efforts). "Cleanups and EDAX analyses can tell us the purity of the molecule and the concentration of the radioisotopes.
3.
Quote: the less than 50-year-old lava flows at Mt. Ngauruhoe, New Zealand (Figure 4), yield a rubidium-strontium “age” of 133 million years, a samarium-neodymium “age” of 197 million years, and a uranium-lead “age” of 3.908 billion years!
It seems that the CReationist are much more obtuse than they wish to appear. If we knew a volcano was 50 years old, why not just get a newspaper of that year. If AIG were smart enough they would know that due to those concordia curves Ive mentioned above,
and
A. for Rubidium/Strontium (did they correct for the non-radiogenic Rb 87 present in the crystal). and its detection range STARTS at about 50 MILLION YEARS
B. Sm/Nd, non radiogenic Nd 143 can cause error, AND this detection technique STARTS AT 100 MILLION YEARS
C. EVEN OEC's dont use Uranium (lead, or lead lead) methods (there are 9 different methods using U isotopes and different daughters). Because U has a 5-10 million year beginning time range. We use it on pre Cambrian crytsals and chondritic meteorites.
For volcanic ash or lava, Id suggest a combo of Potassium Argon, Potassium Calcium,Argon Argon, , Unless qere just trying to screw around and want to show how lab security must be practiced to keep from getting hacked .
Im not a worker doing e microprobe dating. Ive seen it and understand the sensitivitoes and controls. The rewulting He methods actually are looking at INTERMEDIATE daughters . The methods is the U-Th-He by microprobe and its a family of methods . So why AIG makes a biggy about the He sounds more like Steve Austens BS about Polonium "halos" in granite micas.
Im sorry that your information source about radioisotope dating techniques is from a site whose only goal in life is to discredit radiochemistry (not understand it), therefore you, I assume youre just an amateur in all this and dont really understand what goes into it (Trust me theres waaaay lot more on sampl QA, verification and preparations. (As well as the basic phys chem of the whole thing.
The methods have known error bars when the samples are clean and uncontaminated. We have many ways to validate that. We areas certain as we can at this level re: the +/- values of the sample.