Hello everybody my name is Zohir Chowdhury, and now we'll talk about how to measure and
as in radiation so first of all there are quite a few ways of measuring ionizing radiation and
this is pretty confusing and the objective right now is to understand the various unit
of reductive measure and to associate them with their respective way of measuring so first of all
we have relativity absorb those effective dose or dose equivalent and exposure for different
ways of measuring radioactivity what is the definition so radioactivity essentially is
the amount of radiation released by a material that's radioactivity it is measured in Curie in
the United States that is known as common unit so all of everything in here it's the unit that is
used in the US and it's known as a common unit and SI unit which is the new unit of measuring
reductive 'ti is Bakkar l and a conversion between curium background is that one Curie
is 37 billion back around so one Curie it's a lot of relativity absorb those definition
amount of radiation absorbed by an object or person and its measured in rad in the United
States and in it internationally it's gray and one gray it's 100 rad affective those are
those equivalent the definition essentially or trying to understand it essentially it's
how good that absorbed dose of radiation might be at producing an effect so this accounts for
effectiveness or quality of radiation and thus there is some factors involved in here which is
beyond the scope of this lecture it also comes for how the tissue might react so this is the
effective dosage of the dose equivalent and its measured in rem or ram in the US and sievert in
internationally and one sievert again it's 100 Graham finally exposure is defined as amount
of radiation traveling through the air that can cause the exposure and its measured in
rut Jen or Coulomb per kilogram and what Ranjan is equal to zero point zero zero zero two five
eight so what is important here to remember it's very important to make sure in here that you are
able to differentiate each of the different way of measuring with the proper units and that may
require a little bit of time for you to understand so what is radioactivity what is absorbed those
what is effective dose and what is exposure and how they're measured internationally and in the
US so effective dose essentially in here you can understand slightly better so the materials
radioactivity is expressed in here whereas the exposure is what is in the air absorb dosage is
what gets into the object with a person and the biological effect is what goes into the tissue
to cause an effect so the four different way of measuring productivity the exposure to reactivity
absorb dosage and the effective dosage in here you can see occupational dose limits by the Nuclear
Regulatory Commission for different parts of the body are shown in here in milliamps per year so
let's do some quick concept checks which of the following unit is a measure of the biological
effect of our radiation C ramp which of the fallen unit is a measure of an individual's exposure to
radiation a Ranjan which of the following unit is a measure of a materials radioactivity D Curie
okay