It was true in the ‘70s with drilled-out components, in the ‘80s with copious amounts of hair gel and Briko shades, in the ‘90s with those horrific lycra shorts designed to look like blue jeans, and today with carbon racing bikes. A frame and fork weighs less than a six-pack of brew, they’ve got terrific road damping capabilities, are stiffer than an I-beam – at least initially – and most importantly, carbon fiber has an indisputable cool factor.
If the equilibrium concentration of carbon 14 in living plants gives 16 disintegrations per minute per gramme of carbon, estimate the age of a piece of timber if 2.0g of carbon prepared from it gives 15 disintegrations per minute.
Medical use of radioisotopes forms an important part of Medical Physics content syllabuses.
This makes an understanding of the physiological effects off radioactive materials important, but even if you are not studying that option this is 'good for your soul' When a patient is injected with a radioactive tracer the bodily functions expel the isotope from the body by natural processes such as excretion, respiration and perspiration.
All of this evidence supports deep time: the idea, considered credible by scientists since the early 1800s, that the Earth (and the Universe) is millions These limits usually take the form: "Because we observe [X], which occurs at rate [Y], the universe must be at least [Z] years old".
There are three standard creationist responses: First, creationists assert that current rates (Y) are different than past rates.