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When it comes to radiation dose, there are different types of and units of measurement. When you think of a dose of medication, you think of an absolute measurement of the quantity you take.But radiation isn't measured by the quantity you take.Absolute age dating is like saying you are 15 years old and your grandfather is 77 years old.To determine the relative age of different rocks, geologists start with the assumption that unless something has happened, in a sequence of sedimentary rock layers, the newer rock layers will be on top of older ones. This rule is common sense, but it serves as a powerful reference point.Radiation from medical examinations is similar to sunlight.The effect of sunlight on the skin depends on the light's intensity and how long a person stays in it.Because all radiation used in diagnostic medicine has the same low-harm potential, the absorbed dose and the equivalent dose are numerically the same. For diagnostic radiation: The equivalent dose in milli Sievert (m Sv) = the absorbed dose in m Gy.

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Friends may say "You got a lot of sun." Or, "You're red; that must hurt." They are gauging the amount of sunlight, to which you were exposed, by what they see.There are two basic approaches: relative age dating, and absolute age dating.Here is an easy-to understand analogy for your students: relative age dating is like saying that your grandfather is older than you.Yet, you’ve heard the news: Earth is 4.6 billion years old. That corn cob found in an ancient Native American fire pit is 1,000 years old. Geologic age dating—assigning an age to materials—is an entire discipline of its own.In a way this field, called geochronology, is some of the purest detective work earth scientists do.

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