Atividade A = λN
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
About this calculator
Radioactive activity is a measure of the rate of decay of a radioactive substance. It is calculated using the formula A = λN, where A is the activity, λ is the decay constant, and N is the number of radioactive nuclei present. The decay constant λ is related to the half-life (t½) by the equation λ = ln2/t½.
This calculator uses the formula A = (ln2/t½)·N to calculate the radioactive activity. The half-life is the time required for half of the radioactive nuclei to decay. Radioactive activity is an important property in nuclear physics, as it allows estimating the amount of radiation emitted by a substance.
Radioactive activity is used in various areas, such as nuclear medicine, radiotherapy, and radioprotection. Understanding radioactive activity is crucial to assess the risks associated with radiation exposure and to ensure safety in procedures involving radioactive substances.
It is essential to handle radioactive substances with care, as prolonged exposure to radiation can cause health damage. Radioactive activity is a critical measure to evaluate the safety of a substance and ensure it is handled safely.
Frequently asked questions
What is radioactive activity?
Radioactive activity is the rate of decay of a radioactive substance, measured in becquerel (Bq).
What is the relationship between radioactive activity and half-life?
Radioactive activity is inversely proportional to half-life. The shorter the half-life, the higher the radioactive activity.
How is radioactive activity used in nuclear medicine?
Radioactive activity is used to diagnose and treat diseases, such as cancer. It is essential to assess the radiation dose administered to a patient.
What are the necessary precautions when working with radioactive substances?
It is necessary to use personal protective equipment, follow safety protocols, and minimize radiation exposure.
What is the unit of measurement of radioactive activity?
The unit of measurement of radioactive activity is the becquerel (Bq), which represents one decay per second.