How do you calculate the activity of a radioactive element?
To find the activity R using the equation R=0.693Nt1/2 R = 0.693 N t 1 / 2 , we must know N and t1/2.
What is meant by half-life of a radioactive element?
half-life, in radioactivity, the interval of time required for one-half of the atomic nuclei of a radioactive sample to decay (change spontaneously into other nuclear species by emitting particles and energy), or, equivalently, the time interval required for the number of disintegrations per second of a radioactive …
What is the value of 1 Curie?
One curie (1 Ci) is equal to 3.7 × 1010 radioactive decays per second, which is roughly the amount of decays that occur in 1 gram of radium per second and is 3.7 × 1010 becquerels (Bq). In 1975 the becquerel replaced the curie as the official radiation unit in the International System of Units (SI).
Do all radioactive elements have a half-life?
Radioactive elements have a half-life. Half-life occurs naturally in some of the radioactive elements while it could be artificially stimulated in some other elements. The half life of any given element is the time that is required for one half of the sample to decay.
How long does it take for a radioactive substance to decay?
Each and every radioactive element has its own half-life. For instance, 238 U has a half-life of 4.5billion years. A radioactive substance has a half-life of 20 minutes. If we begin with a 500 g sample, how much of the original sample remains after two hours?
Which radioactive nuclide will decay at the fastest rate?
A radioactive nuclide with a short half-life will decay at a faster rate than another radioactive nuclide that has a longer half-life. Figure shows the decay curve for two radioactive nuclides, P and Q. 1. Tin-108 has a half-life of 10.3 minutes. A radioactive sample contains 72 g of tin-108.
What is the half life of antimony-133?
Figure shows the decay curve for antimony-133 which has a half-life of 2.5 minutes. A radioactive nuclide with a short half-life will decay at a faster rate than another radioactive nuclide that has a longer half-life.