To read the time on this radioactive clock, scientists use a device called a mass spectrometer to measure the number of parent and daughter atoms. The ratio of parents to daughters can tell the researcher how old the specimen is.
http://science.howstuffworks.com/environmental/earth/geology/dinosaur-bone-age.htm
Some of the calculated ages, though, lined up with the already assumed age of 64 million years, and these data were hand-picked to represent the age of the fossil. Thus, the technique was called the first successful direct dating of fossil vertebrate bone—a classic case of circular reasoning.3.
https://www.icr.org/article/5910/
The bone was 68 million years old, and conventional wisdom about fossilization is that all soft tissue, from blood to brains, decomposes. Only hard parts, like bones and teeth, can become fossils. But for some people, the discovery raised a different question. How do scientists know the bones are really 68 million years old? Today's knowledge of fossil ages comes primarily from radiometric dating, also known as radioactive dating.
http://science.howstuffworks.com/environmental/earth/geology/dinosaur-bone-age.htm
For relatively recent fossils, dating by carbon 14 is the most accurate method. For older fossils it is necessary to analyse the geological layer in which they are found; fossils located in an undisturbed geological layer of a certain age, are the same age as the layer in which they are found, necessarily. For relatively recent fossils, dating by carbon 14 is the most accurate method.
http://www.answers.com/Q/How_do_scientists_date_fossils
The short half-life is only part of the problem when dating dinosaur bones -- researchers also have to find enough of the parent and daughter atoms to measure. Read on to see what it takes to date a fossil and what volcanic ash has to do with it.
http://science.howstuffworks.com/environmental/earth/geology/dinosaur-bone-age.htm
The scientists analyzed the abundance of radioactive isotopes of certain elements that had leeched into the edges of buried dinosaur bone from the San Juan Basin in northern New Mexico and southern Colorado. Their new technique involved first polishing a slice of bone and then shooting a laser beam onto its surface.
https://www.icr.org/article/5910/
Paleontologists can radioactively date a fossil by determining the amount of carbon-14 isotopes remaining in the specimen. Elements decay by half-lives, meaning that after one… half-life, half of the sample's radioactive particles are gone.
http://www.answers.com/Q/How_do_scientists_date_fossils
What scientists use to date the exact age of fossils? How do scientist tell how old a fossil is? Stratigraphy is the common method for dating fossils. The fossil will be younger than layers below it, and older than layers above it, provided the fossil beds have not been d…isturbed.
http://www.answers.com/Q/How_do_scientists_date_fossils
Resources › Physical Sciences Resources › Radiometric Dating. A trio of geologists has published what they called the first successful direct dating of dinosaur bone. They used a new laser technique to measure radioisotopes in the bone, yielding an age of millions of years.
https://www.icr.org/article/5910/
The answer is simple. Any indication that these dinosaur bones are not millions of years old might call the whole evolutionary picture into question, and might therefore offer evidence for a recent creation. And in the world of secular science, that cannot be allowed to happen, even if the data call for it.
https://www.icr.org/article/5910/
how can scientists date fossils
Scientists can date fossils by the Stratigraphy method. Scientists can date fossils by stratigraphy method.