Atividade N(t)
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
About this calculator
The Activity Decay Calculator is an online tool that allows users to calculate the activity of a radioactive substance after a given period of time. The activity is calculated based on the formula N = N₀·0.5^(t/t½), where N is the final activity, N₀ is the initial activity, t is the elapsed time, and t½ is the half-life of the substance.
The formula used is based on the law of radioactive decay, which describes how the activity of a radioactive substance decreases over time. The half-life is a fundamental parameter in this process, as it is the time required for the activity of the substance to be reduced by half. With this calculator, it is possible to determine the activity of a substance after a given period, which is essential in various applications, such as nuclear medicine and radiation safety.
It is essential to use this calculator with care, as radioactive decay is a complex process that involves many factors. Additionally, it is crucial to have knowledge about the properties of the radioactive substance in question, such as its half-life and initial activity. With this information, it is possible to obtain accurate and reliable results.
The Activity Decay Calculator is a valuable tool for professionals and students working with nuclear physics and radiation. It allows for quick and accurate calculations, saving time and effort compared to manual calculations.
Frequently asked questions
What is half-life?
Half-life is the time required for the activity of a radioactive substance to be reduced by half.
How does the calculator work?
The calculator uses the formula N = N₀·0.5^(t/t½) to calculate the final activity of the substance.
What units are used?
The units used are dependent on the substance and type of activity. Typically, time is measured in seconds, minutes, hours, or years, and activity is measured in becquerel (Bq) or curie (Ci).
Can I use the calculator for any radioactive substance?
Yes, as long as you know the half-life and initial activity of the substance.
Is the calculator accurate?
Yes, the calculator is accurate as long as the input information is correct and the formula is applied correctly.