We are exposed daily to these radioactive sources

You will be surprised because the familiar items around you contain radiation. Accordingly, each year our body receives radiation equivalent to 600 mrem / year.

However, fortunately, the radioactivity of these objects is extremely low, can not harm humans too large, so we can function normally when in contact with them.

Long flights make us more exposed to radiation.(Illustration).

Why do we all have radioactive substances around us?

Radioactive substances are substances capable of emitting radiation (ptoton particles, electrons, neutrons, .) and in fact, these substances existed before humanity appeared.

Therefore, they still exist today, although the level of radiation has decreased significantly.

The list of familiar objects and objects can radiate radiation.

1. Food and water

Unexpectedly, every day we are "eating" and "drinking" radioactivity.

The food we eat every day like vegetables, meat . contains an amount of isotopes K - 40 and Ra - 226 (Radium) . These are unstable radioactive atoms that transform and emit nuclear radiation themselves.

Even natural drinking water has an amount of radioactive Uranium and Thorium !

But don't worry because they have very little (about 30mrem / year) and are safe for us.

2. Sun.

As a huge energy source that provides energy for all life on Earth, the Sun is a giant nuclear fusion reactor.

Estimated per second, the Sun produces energy (due to fusion reaction) equivalent to 1 billion tons of explosives. That's terrible, isn't it!

The Sun works cyclically so the amount of radiation also changes, although we are protected by the Earth's dense atmosphere, there are still places (especially high mountains) that can still pass through radiation. cross and harm people.

3. Long distance aircraft

Long flights make us more exposed to radiation.(Illustration).

When we fly in the sky for a long time (over 8 hours), the air layer dilutes radioactive rays from the Sun and the universe easily penetrates us.

Specifically, people will receive radiation from 2-5 mrem, equal to 1/2 compared to when taking X-rays (10 mem).

Security checks also make us exposed to radiation.(Illustration.)

Not only that, but the security control door with devices that can emit radiation also shines through us (0.002 mr).

4. Mobile phone

This device is close and almost always carried by people, but when using mobile phones, people are also influenced by different types of rays.

Dr. Le Doan Phac, Institute of Atomic Energy said: The nature of radioactivity is artificial radiation . Therefore, mobile phones are also sources of radioactivity because it uses electromagnetic (artificial) radiation in the microwave range.

The World Health Organization (WHO) and the International Agency for Research on Cancer (IARC) have also issued a warning about the danger from phone radiation and email (although no conclusive conclusions have been made yet). relationship between them. .T

So is your phone at a safe level?

Each type of phone has different radiation levels, based on the SAR (specific absorption rate), we will know the radiation level of the mobile phone.

Accordingly, the safe level is below 0.3W / kg, and 1.6W / kg is a high level, which can be dangerous.

Advice from experts:

When having a long talk, use headphones to avoid contact with the brain and the phone. Just put your phone on your ear when the other person picks up the phone because many people have a habit of listening to . ringback tones!

When the battery is low, avoid using and calling (because the radiation reaches maximum).

Look at the table below to see if your phone is in the top 20 phones with the highest SAR level.

20 types of phones have the highest SAR.

20 types of phones have the lowest SAR.

5. Medical devices

Medical devices are powerful sources of radiation.(Illustration).

The hospital environment with machine equipment also contains X-rays (such as X-rays, CT-Scan scanners .). These are quite powerful radioactive sources because they account for 96% of the radiation on us.

People who often work here (doctors, nurses, midwives, etc.) cannot avoid contact with them for a long time, so they can be affected by the body.