How can radioisotopes be used.?

Calcium is absorbed into the bloodstream by the cell that line the small intestine. Also bone cell called osteoblasts hold calcium from the blood and use it to form the mineralized part of bone call the matrix. Osteoporosis is a condition in which bones become cracked and brittle because of a decrease surrounded by the density of bone matrix. How can radioisotopes be used to determine whether intestinal cells or osteoblasts deficiency the ability to process calcium within a person next to osteoporosis. Radioisotopes of familiar elements such as carbon can serve as tracers because they are chemically terribly similar to the non-radioactive nuclides, so most chemical, biological, and ecological processes treat them contained by a near equal way. One can consequently examine the result with a radiation detector, such as a geiger counter, to determine where on earth the provided atoms ended up.
Basically they can be used to trace the calcium and other cell in the intenstine to see if is individual produced by the osteoblasts.