Zircons will loose their tracks at higher temperatures of 200.
The original atom is referred to as the parent and the following decay products are referred to as the daughter.
For example: after the it forms a component of all organic compounds and is therefore fundamental to life. Libby of the University of Chicago predicted the existence of carbon-14 before it was actually detected and formulated a hypothesis that radiocarbon might exist in living matter.
Willard Libby and his colleague Ernest Anderson showed that collected from sewage works had measurable radiocarbon activity whereas methane produced from petroleum did not.
Perseverance over three years of secret research to develop the radiocarbon method came into fruition and in 1960 Libby received the Nobel Prize for chemistry for turning his vision into an invaluable tool.
Shortly after Becquerel's find, Marie Curie, a French chemist, isolated another highly radioactive element, .