Review of the incident: It has been a week since the accident that the radioactive source 192 was lost from Nanjing. Although it has been recovered and the accident did not cause any harm to people, the Ministry of Environmental Protection still categorizes the incident as a major radiation accident. The harm of radiation is large and the scope of impact is wide.

At the scene of the accident, wear protective clothing to dig

After the accident, it caused the attention of all relevant units and leaders. Zhou Qizheng, deputy chief engineer of the Nuclear and Radiation Safety Center of the Ministry of Environmental Protection, said that after a radioactive source accident is lost, the safety of the radioactive source must be ensured first, and the relevant area should be narrowed down by the instrument. The scope of the final radiation source was a grassland of about 2 square meters. The grass was very deep, and the radioactive source was very small, with a diameter of 8 mm and a length of 15 cm, like a necklace. Because radiation sources are bare and people cannot be close for long periods of time, various protective measures have been taken.

Fang Guiping, deputy director of the Nanjing Environmental Protection Bureau, said that on the afternoon of the 10th, the on-site command used "human-sea tactics." Each staff member was digging through protective clothing and looking for 2-3 minutes. He was then replaced by another person to avoid radiation for a long time. After four rounds of professional personnel entered the field locking zone operation, when the tenth staff worked, they eventually succeeded in finding out the missing radioactive sources and successfully placed lead cans for recycling.

How dangerous is 铱-192?

At present, according to international standards, China divides radioactive sources into five types: high-risk, high-risk, medium-risk, low-risk, and extremely low-risk sources, depending on the species, energy size, and radioactivity.

Zhou Qichen said that the Nanjing--192, which was lost to Nanjing for industrial inspections, was newly purchased five months ago. According to the current activity of the missing thorium-192, the environmental protection department determined it as a second-class high-risk source.

"The loss of radioactive sources is exposed, so the risk is high," he said.

Professor Guo Qiuju, associate professor of the Department of Technical Physics at Peking University’s School of Physics, said that thorium-192 needs to be preserved in lead tanks and other shielded containers. "If used in peacetime, strictly follow the requirements, it should be no problem."

Experts said that if people are picked up or placed on the body, such close contact may cause people to receive a larger dose of radiation. Previously there have been cases of skin burns on the person, or the fact that the radioactive source was placed in a trouser pocket, resulting in an amputation. If the exposure time is longer, there is also a fatal risk.

China Labor Insurance Network Editor's Encyclopedia:

What is protective clothing?

In daily life, the radiation generated by electrical appliances will not cause harm to most people, but it will cause adverse reactions to some special people. The elderly, children, pregnant women and patients are more sensitive to electromagnetic radiation. For example, if pregnant women work for a long time at the computer, it will affect the health of the fetus. Therefore, many pregnant women will exclusively purchase vests, aprons and covers with electromagnetic protective fabrics to protect themselves from electromagnetic radiation.

Protective clothing is used to prevent physical, chemical and biological factors from harming external factors and protecting the body's overalls. Protective clothing types include fire protective clothing, industrial protective clothing, medical protective clothing, military protective clothing and protective clothing for special people.

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