The activity of a radioactive source is the rate at which the nuclei of the source decay. What is the unit for the activity of a radioactive source?

In a radioactive material the activity at time t1, is A1 and at a later time t2, it is A2. If the decay constant of the material is λ, thenA1=A2e−λ(t1−t2)A1=A2eλ(t1−t2)A1=A2(t2/t1)A1=A2

A rate of decay of a radioactive element is independent of temperature, pressure, Infact for any external conditions. A simple law discovered by Rutherford states that a certain fraction of any sample of radioactive element undergoes change in a unit time. If we start with 10 mg of the radioactive substance  (t​1​​2  =  1day)  , only  5mg   will be left at the end of the first day. At the end of 2nd day 2.5 mg will be left and so on. λ  =  2.303tlogaa − x A human body required the  0.01μ   activity of radioactive substance after 24 hours. Half life of radioactive is 6  hours. Then injection of maximum activity of radioactive substance that can be injected:

The activity of a radioactive material is 2.56 × 10–3 Ci. If the half life of the material is 5 days, after how many days the activity will become 2 × 10–5 Ci

Radio activity is the process by which a nucleus of an unstable atom loses energy by emitting ionizing radiation. A material that spontaneously emits this kind of radiations which includes a, b, g rays is considered radioactive.The positively charged particle with 2 units of relative of charge and 4 units of mass isSelect an answerABCDpositron

Match each unit used in dosimetry to its definition.Group of answer choicesSI unit of absorbed dose, equal to 1 joule of energy absorbed per kilogram of materialUnit of radiation exposure, equal to the production of 2.58x10-4 coulombs of charge produced by the radiation per kilogram of dry air through which the radiation passesSI unit of activity, equal to one radioactive decay per secondOlder unit of activity, defined to be 3.7x1010 transformations per second, which is approximately the activity of one gram of radiumUnit relating absorbed dose to the degree of biological damage caused by a particular type of radiation