Helium leakage dating
The rate of helium leakage depends primarily on temperature.The higher the temperature, the greater the leakage. Helium leakage can be measured in core samples from various depths down as far as a few miles below the surface.When this occurs, the daughter products will shoot out in opposite directions leaving distinct radiohalo tracks.Daughter products along with size and color of tracks indicate exactly what the original parent element and isotope were.
The applicability, accuracy and usefulness of each method deserve scrutiny.
By measuring the amount of remaining helium in samples at specific depth intervals, and knowing temperature at each interval, known leak rate with temperature establishes the activity level and time.
Actual helium measurements taken from core samples submitted to independent labs for blind testing revealed that the Earth’s age is roughly 6000 years (±2000 years). Evolutionary scientists performing the tests did not consider pressure to be a factor due to the hardness of the zircon crystals.
Radioactive decay rate is a logarithmic function of time commonly called half-life.
Half-life is assumed to be constant and generally unaffected by heat, pressure, magnetic or electric fields, local chemistry or other environmental factors.
[RATE Conference: predicted in 2000, measured in 2001] The obvious discrepancy between U-PB dating and helium leakage dating in the same samples requires us to look for some way to reconcile. Pressure was factored into measurements of mica and biotite from the core samples.