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12/01/2015

Claudia, Argentina asked:

When I was younger I was told not to sit too close to the TV. Is it an urban myth that it's dangerous to sit too close? Or does the TV emit radiation? Does this still apply to modern televisions?

Answer
We put this question to Andy Karam, adjunct professor at the Rochester Institute of Technology...

Andy - Televisions really do give off radiation. But having said that, it’s only a little bit of radiation and it’s not that dangerous. What happens is that anything with a cathode ray tube, a tube where you shoot high-energy electrons at some sort of screen, when those electrons hit the screen, they give off very low energy x-ray radiation. This is the same way that x-rays are produced in regular x-ray tubes. So, if you're sitting close to a cathode ray tube, whether a computer monitor, a television screen, a radar set or anything else with that type of technology, you're going to be getting low doses of x-ray radiation.

Now having said that, I’ve got to emphasize, they're low doses of radiation. It’s not enough to be dangerous and in fact, if you watch your television for several hours a day all year, you're getting less radiation than you would from a single medical x-ray and less radiation than you get from the radioactivity that’s just naturally within your body. So, it’s something that we can measure, but it’s not something that’s harmful.

LCD and plasma screens don't give off any radiation at all. They don't use high-energy electrons. It’s a different type of technology. I could not say that they're safer because I don't consider the radiation from cathode ray tubes to be a risk, but I can say that they give off less radiation. As far as sitting too close to the television goes, the further back you are, the lower the radiation dose will be. But having said that, I don't consider the radiation dose even at a distance of just one metre to be dangerous

12/01/2015

What Is Aplastic Anemia?

Aplastic anemia (a-PLAS-tik uh-NEE-me-uh) is a blood disorder in which the body's bone marrow doesn't make enough new blood cells. Bone marrow is a sponge-like tissue inside the bones. It makes stem cells that develop into red blood cells, white blood cells, and platelets (PLATE-lets).

Red blood cells carry oxygen to all parts of your body. They also carry carbon dioxide (a waste product) to your lungs to be exhaled. White blood cells help your body fight infections. Platelets are blood cell fragments that stick together to seal small cuts or breaks on blood vessel walls and stop bleeding.

It's normal for blood cells to die. The lifespan of red blood cells is about 120 days. White blood cells live less than a day. Platelets live about 6 days. As a result, your bone marrow must constantly make new blood cells.

If your bone marrow can't make enough new blood cells, many health problems can occur. These problems include irregular heartbeats called arrhythmias (ah-RITH-me-ahs), an enlarged heart, heart failure, infections, and bleeding. Severe aplastic anemia can even cause death.

Overview

Aplastic anemia is a type of anemia. The term "anemia" usually refers to a condition in which your blood has a lower than normal number of red blood cells. Anemia also can occur if your red blood cells don't contain enough hemoglobin (HEE-muh-glow-bin). This iron-rich protein helps carry oxygen to your body.

In people who have aplastic anemia, the body doesn't make enough red blood cells, white blood cells, and platelets. This is because the bone marrow's stem cells are damaged. (Aplastic anemia also is called bone marrow failure.)

Many diseases, conditions, and factors can damage the stem cells. These conditions can be acquired or inherited. "Acquired" means you aren't born with the condition, but you develop it. "Inherited" means your parents passed the gene for the condition on to you.

In many people who have aplastic anemia, the cause is unknown.

Outlook

Aplastic anemia is a rare but serious disorder. It can develop suddenly or slowly. The disorder tends to get worse over time, unless its cause is found and treated. Treatments for aplastic anemia include blood transfusions, blood and marrow stem cell transplants, and medicines.

With prompt and proper care, many people who have aplastic anemia can be successfully treated. Blood and marrow stem cell transplants may offer a cure for some people who have aplastic anemia.

12/01/2015

TV Positioning
So, now that you have that beautiful flat panel TV home, where exactly does it go? You want you viewing to be as natural as possible and easy on your eyes and body. Here are some great tips to make sure that your home theater is a comfortable as possible.
TV Height
Viewing Height
Getting the right height is easy. The trick is to watch your tilt.
Sit where you’d sit to watch your TV. Get comfortable. Then, measure the height from the ground to your eyes. Take that length and stick a piece of tape on the wall at that same height. That’s going to be the sweet spot, the ideal place for the middle of your screen (feel free to sit back and double-check that the spot seems natural to you for viewing).
If you’re going to tilt your screen, keep it to a minimum. Plasma displays shouldn’t be tilted at all technically, and LCD flat panels shouldn’t go beyond 10º. Tilting helps reduce glare and is necessary for higher mounting applications (like bedrooms), but too much of an angle can lead to uncomfortable viewing and strain

12/01/2015

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TV Radiation Can Harm: Truth or Myth?
PostDateIcon August 16th, 2011 | PostAuthorIcon Author: admin
Television sets or TVs have been around since 1920s. Since their advent, communication has never been the same. TVs offered something better than what the radios did, as they allowed the transmission and reception of moving images rather than just sound. From their early forms like those equipped with cathode ray tubes, to today’s LCD and LED cousins, TVs have paved the way for broadcasting and entertainment. Since TVs made information and entertainment readily available, many people tune in, sitting in front of their TV sets for hours. The problem is TVs can emit EMFs.

EMFs or electromagnetic fields are fields produced by the movement of electrically charged objects. EMFs can have harmful effects to health if exposure is greater than normal circumstances. For example, in the United States, for people who are exposed to EMFs 10,000 greater than the average are given precautionary measures by the US National Institute for Occupational Safety and Health. There are also studies claiming EMFs cause biological changes in the body like brain cell damage, DNA damage, excited brain cells, leukemia cell growth, increased blood pressure, and protein changes in the skin among others. EMFs were also said to cause miscarriage, asthma, and others. Though there are scientific bases, most of the harmful effects of EMFs are those that come from stronger EMF sources like X-rays.

What about TVs?

TVs and computer monitors emit low levels of radiation. However, some scientists argue that frequent and long term exposure to low levels of radiation can still have effects to human health. And since some people can sit all day in front of their computers or TVs, then they’re more at risk of overexposure to EMFs or radiation.

The problem is, up until now, there exists no conclusive evidence about the harm that exposure to TV radiation can cause. Even the Environmental Protection Agency (EPA) has issued their viewpoint regarding this matter. EPA says, “It should be emphasized that there is no evidence that radiation from televisions or computers has resulted in human injury.”

The answer lies with the kind of TV used. Flat panels TVs such as LCDs do not emit any kind of X-radiation. As for the other kinds of TV sets, the US Food and Drug Administration (FDA) scrutinizes the manufacture of TVs that are being sold to the public. According to FDA, “All TV manufacturers must submit written radiation safety reports to FDA outlining how they assure that each set coming off the assembly line complies with the Federal x-ray radiation limit.” Furthermore, FDA declared that “Television receivers imported into the United States, which do not meet the standards, are not allowed into the country and are destroyed if not exported in 90 days.”

While Americans are assured of the safety of TV sets under normal circumstances, this thing about TV radiation’s health effects is still inconclusive. So for the sake of health and as a precautionary measure, it would be wise to just limit exposure to any amount of radiation. One way is by increasing distance from the EMF source. People at home, especially the children, should be placed as far away from the TV, microwave oven, and computer screen as possible. Limit duration of exposure to TV and computer screens. If possible, install monitor filters to limit the amount of radiation.

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