O que é MATERIAL RADIOATIVO? Você Sabia que Tem um Material Radioativo em Casa?

Did you know that you could have radioactive material in your kitchen right now? But after all, what is a Radioactive Material? Hey Engineering Lovers, you've certainly heard somewhere about radioactive material, whether in a report, a series or perhaps in some disaster out there.

But what exactly is radioactive material? Well, Radioactive material refers to substances that emit radiation due to the decay of their unstable atomic nuclei. This radiation can include alpha particles, beta particles and gamma rays, and is a natural phenomenon that occurs when certain elements have nuclei with excess energy or mass.

To understand what radioactive material is, it is important to first understand the structure of the atom. An atom is made up of a nucleus that contains protons (positive charge) and neutrons (no charge). And the Electrosphere is where electrons ( negative charge) orbit around the nucleus.

Each chemical element in the periodic table is formed by a combination of protons, neutrals and electrons, where each element only varies the amount of these elements. Chemical elements can exist in different forms called isotopes. Isotopes are variants of the same element with the same number of protons but different numbers of neutrons.

Some isotopes are stable, while others are unstable, leading to the phenomenon of radioactivity, which is the emission of radiation caused by radioactive decay. There are three main types of radiation emitted: Alpha Particles (α) consist of 2 protons and 2 neutrons having the same structure as the nucleus of the helium atom. It has a positive charge, as it is made up of 2 positively charged protons and 2 neutrons, which have no charge.

And they are relatively large and less penetrating, and can be blocked by a sheet of paper. Beta (β) Particles can be composed of high-speed electrons or positrons emitted from the nucleus. They are smaller and more penetrating than alpha particles, but can be blocked by aluminum foil.

Gamma Rays (γ) are high-energy electromagnetic waves, that is, they have no mass or charge. They are highly penetrating and require dense materials such as lead or concrete to block. An important concept related to radioactive material is half-life, which is the time required for half of the nuclei in a sample of radioactive material to disintegrate.

The half-life varies widely between different isotopes, from fractions of a second to billions of years. For example, Uranium-238 (U-238), an isotope of uranium, has a half-life of approximately 4. 5 billion years.

Carbon-14 (C-14), used in radiocarbon dating, has a half-life of around 5,730 years. And Iodine-131 (I-131), used in medical treatments, has a half-life of about 8 days. As you may know, radioactive elements can be used in a series of applications, and we have a video here on the channel that talks about nuclear plants, which use properties of radiation to generate energy.

If you haven't seen this video, stay with us until the end as there will be a card for this video. But they have other applications. In medicine, radioactive isotopes are used in diagnoses such as PET Scan, which is an imaging diagnostic test, and even cancer treatment such as radiotherapy.

We can use this radiation in Dating, which is determining the age of some objects. Techniques such as carbon-14 dating are used to determine the age of archaeological artifacts and fossils. When we are alive, there is an exchange of carbon with the elements and the environment, and as we incorporate it into our structure, carbon 14 becomes constant.

However, when we die, we stop exchanging carbon with the environment, that is, we no longer acquire carbon 14. This way, carbon 14, which is a radioactive material, starts to decay, because it turns into nitrogen 14 per through the issuance of particular beta. Knowing that carbon 14 has a half-life of 5730, if we find a fossil that has a mass of 50% carbon 14 and 50% nitrogen 14, we can say that the age of the analyzed fossil is approximately 5730 years.

But answer me one thing, what do you mean I have a radioactive element in my kitchen? Well, if you have this in your kitchen, then yes, you have a radioactive element in your home. Bananas can be considered slightly radioactive due to the presence of potassium-40.

This potassium is an essential chemical element for several biological functions and is present in many foods, including bananas. Natural potassium is composed of three isotopes: Potassium-39 which is about 93. 258% of natural potassium.

Potassium-41 which is about 6,730% of natural potassium. And Potassium-40 which is about 0. 012% of natural potassium.

The amount of potassium 40 in a typical banana is very small, but it still contributes to a minuscule dose of radiation. This is often used as an example to illustrate that many common substances can be slightly radioactive without posing a danger. Radiation dose is usually measured in Sieverts (Sv) or microsieverts (µSv).

The radiation from a banana is approximately 0. 1 microsieverts. For comparison, the average annual dose of radiation received by a person is about 2,000 to 3,000 microsieverts, mostly from natural sources like soil, cosmic radiation, and even airborne radon.

But don't worry, despite being radioactive, the radiation emitted by a banana is insignificant and does not pose a health risk. In fact, the amount of radiation is so small that eating bananas regularly does not significantly increase radiation exposure. So don't worry about her.

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