Fears have grown about radiation exposure since Russia's attack on a Ukrainian nuclear facility. But taking iodine won't always help. It can, in fact, be dangerous.

    When there is an accident at a nuclear power plant — if there's an explosion or a leak or it's damaged in some way in war — radioactive iodine is one of the first substances that's released into the atmosphere.

    If that radioactive iodine gets into the body, it can damage cells in the thyroid and result in cancer.

    You can inhale radiation, or it can get into your body via the skin. But you can't see, smell or taste it in the air. It's an invisible threat.

    Some of the worst effects of an overexposure to radiation are thyroid cancer, tumors, acute leukemia, eye diseases and psychological or mental disorders. Radiation can even damage your genes for generations to come.

    In the most extreme cases, a high dose of radiation over a short period of time will cause death within days or even hours.    

    Is it worth taking iodine against radiation?

    Our bodies do not produce iodine themselves. But we do need it, so we consume iodine through food or supplements.

    You can purchase  iodine in the form of a tablet. When consumed, the iodine is collected or stored in the thyroid gland, where it is used to produce hormones . They help various bodily functions and even support the development of the brain.

    The thyroid can, however, become saturated with iodine. And when that happens it can't store anymore.

    So, the theory is that if you take enough "good" iodine, there will be no room left in the thyroid for any "bad" or radioactive iodine. That radioactive iodine should then simply pass through the body and get excreted via the kidneys.

    Our bodies don't produce iodine but we need it, so we have to consume it via food, for instance

    But don't take iodine as a precaution

    There is no point in taking iodine as a precautionary measure to prevent against radiation exposure after a leak or attack on a nuclear power plant.

    The thyroid only stores iodine for a limited amount of time.

    And taking too much iodine — even the good stuff — can be dangerous.

    Many people in Germany, for instance, suffer from an overactive thyroid . And health experts advise against taking any iodine supplements unless there is an acute medical reason to do so. 

    Germany's Federal Ministry for the Environment, Nature Conservation, Nuclear Safety and Consumer Protection ( BMUV ) says iodine supplements can help after a nuclear power plant accident in a radius of up to 100 kilometers (62 miles).

    But the iodine is still only effective if taken when it is needed. Experts say an iodine "block" only has a chance of helping if the good iodine is taken just before or during contact with radioactive iodine

    Cesium, strontium absorbed by the body

    The radioactive isotopes iodine 131 and iodine 133 cause thyroid cancer. They are also the isotopes most associated with radiation exposure caused by a leak or explosion at a nuclear power plant.

    The radioactive isotopes strontium 90 and cesium 137 are also part of the mix. They settle in bone tissue and likewise increase the risk of cancer.

    Our body mistakes these isotopes for calcium. It can absorb and use them in the physiological processes of our muscles and bones. If that happens, the bone marrow can spin out of control.

    Bone marrow is responsible for producing new blood cells. And when it fails, it can lead to a blood cancer known as leukemia, which is often fatal.

    Damage to genetic material

    Radioactive exposure can also damage genetic material in the body.

    That is known to have happened after atomic bombs were dropped on the Japanese cities of Nagasaki and Hiroshima at the end of World War II — children were born with deformities after the war.

    Long-term effects were also observed after an accident at the Chernobyl nuclear facility in Ukraine in April 1986.

    Twenty years after the catastrophe, cancer rates in most of the affected regions had risen by 40%. An estimated 25,000 people in Russia died as a result of having helped clean up the reactor site.

    Almost no treatment for radiation exposure

    There is hardly any treatment for radiation exposure. What's decisive is whether a person has been "contaminated" or whether the radiation has been "incorporated" into the body.

    In the case of a contamination, radioactive waste settles on the surface of the body.

    It may sound ridiculous, but the first thing people should do in those cases is wash off the radioactive waste with normal soap and water.

    A "radioactive incorporation" is far more dangerous. Once radioactive waste has made its way into the body, it's almost impossible to flush it out again.

    Intensity and time

    Radioactivity is measured in millisieverts.

    Exposure with 250 millisieverts (or 0.25 sievert), over a short period of time, is enough to cause radiation sickness.

    To put that in context, Germany's Federal Office for Radiation Protection (BfS) tends to measure an average of 2.1 millisievert in the environment. That's over a whole year.

    At a measure of 4,000 millisievert (or 4 sievert), acute radiation sickness starts quickly. The risk of death increases significantly. At 6 sievert, the risk of death is 100% — there is no chance of survival. Death is almost immediate.

    • Chernobyl: The people who've stayed

      The contagious optimism of Baba Gania

      Baba Gania (left) is 86 years old. She survived her husband who died a decade ago. For the past 25 years, Gania has taken care of her mentally disabled sister Sonya (right). "I am not afraid of radiation. I boil the mushrooms till all the radiation is gone!" she says proudly. Photographer Alina Rudya visited her several times over the past years: "She is the warmest and kindest person I know."

    • Chernobyl: The people who've stayed

      Hastily left: Abandoned houses in the Zone

      Gania and her sister live in Kupuvate, a village in the 30-kilometer (19-mile) exclusion zone around the ruins of the Chernobyl nuclear power plant. After the accident in April 1986, hundreds of thousands of residents in the area were hastily evacuated. Most houses in Kupovate remained abandoned. Gania is using this one in the neighborhood to store her and her sister’s coffins.

    • Chernobyl: The people who've stayed

      Where the dead return

      "The cemetery of Kupuvate looks like any other village cemetery in Ukraine," photographer Alina Rudya reports. "Many people who are buried here were evacuated and spent their lives outside of the nuclear radiated zone, only to return after their death."

    • Chernobyl: The people who've stayed

      The last wish of Baba Marusia

      The returnees look after the remains of their family — like Baba Marusia, who came to clean her mother's grave. Her daughter lives in Kyiv, sharing a one-bedroom apartment with her husband and two children. "I am happy I stayed here, though. It is my homeland. That is where I want to be buried." And she adds: "But next to my mother, not my husband."

    • Chernobyl: The people who've stayed

      Samosely: Those who returned to stay

      Galyna Ivanivna is another of the few self-settlers in the zone, the so-called samosely. "My life flew by in a blink of an eye. I am 82 years old right now and it is as if I’ve never lived. When I was younger, I wanted to travel the world. I remember dreaming of having a free ticket which would take me around the globe. But I never managed to go further than Kyiv."

    • Chernobyl: The people who've stayed

      Living in a world of his own

      Ivan Ivanovych and his wife were also among the few hundred who decided to move back to the contaminated area in the 80s. Ivan has become somewhat of a local star among the tourists visiting the area. His wife died some years ago — "But every time I visit him, he tells me it happened 'last year.' He is full of stories, which vary between truth and imagination," says the photographer.

    • Chernobyl: The people who've stayed

      Witnesses of the past

      One week before the 32nd anniversary of the Chernobyl disaster on April 26, Ukranian photographer Alina Rudya visited the village of Opachichi. She found one old woman who still lives there, but most of the other self-settlers have died. Empty houses have been left open with old pictures, letters, Ukrainian embroidered towels and furniture silently serving witness.

    • Chernobyl: The people who've stayed

      Slowly saying goodbye

      Marusia is watching over her husband Ivan, who recently had a stroke and suffers from dementia. "Sometimes he wakes up at night and goes searching for his tractor. He worked on one for 42 years." She herself is concerned about dying slowly. "I don’t want to be a burden to my kids and grandkids."

    • Chernobyl: The people who've stayed

      Providing for death

      Before Ivan fell ill, he built two coffins to prepare for both his death and the death of his wife. They are stored in a shed next to the house. "The lower one is for me and the upper one for my old man," Marusia explains.

    • Chernobyl: The people who've stayed

      The last self-settlers

      Only a few "samosely" are still living in the exclusion zone. Alina Rudya, who was herself born near Chernobyl, has returned several times and photographed them for her long-term project, which she is planning to publish as a book. "Visiting abandoned villages feels more and more sad each time. Every time I come, someone has died, since almost all of the self-settlers are over 70 years old."

    Edited by: Alexander Freund

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    Source: www.dw.com

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