The radioactivity exceeds the standard by nearly 7 times, and the radiation monitoring and detection cannot be ignored

【Hot attention from Chemical Machinery Equipment Network ] Recently, "Radioactivity exceeded the standard by nearly 7 times! 1,006 tons of imported zircon sand was intercepted by Zhanjiang Customs" on a hot search.
Zircon sand is an important raw material in many industries and is widely used in casting , Ceramics, metallurgy, optical glass and refractory materials, the domestic demand is large, and the import volume is large.
Because zircon placer products contain naturally associated radioactive elements such as thorium, uranium, radium, and potassium, cases of excessive radioactivity detected are not uncommon.

It is reported that a batch of zircon sands with radioactivity exceeding the standard seized by Maoming Customs this time contains a total of 37 container TEUs, totaling 1,006 tons.
Customs officers found hand-held radiation during inspectionThe data of the detector is abnormal.
After testing, the cargo gamma ray γ is between 3.
18Sv/h-7.
38Sv/h, and the highest value is nearly 7 times higher than the national minimum radioactivity standard.

If you stay in an environment with excessive radioactivity for a long time, it will affect the safety and health of humans, animals and plants, and cause greater harm.
Let's learn about the hazards with the editor below!
 

Excessive radioactivity is more harmful
 

Radioactivity exists in all substances.
This is an objective fact that has existed for hundreds of millions of years.
It is a normal phenomenon, but once the standard is exceeded, radiation is formed, and the harm is relatively great.

 

　　Radioactive materials not only act on the part where they are located, but also affect the entire body.
Radioactive substances can cause damage to the central nervous system, neuroendocrine system and blood system; it can change the permeability of blood vessels, leading to bleeding and concurrent infections.
Large doses of radioactive materials can quickly cause pathological changes when they work.

 

　　In detail, mild injury can cause mild acute radiation sickness, such as fatigue, malaise, and loss of appetite; moderate injury can cause moderate acute radiation sickness, such as dizziness, fatigue, nausea, vomiting, and decreased white blood cell count; severe injury, It can cause severe acute radiation sickness.
Although treated, 50% of the exposed persons may die within 30 days, and the remaining 50% can recover, manifesting as multiple vomiting, diarrhea, and a significant decrease in white blood cell count; extremely severe injury, causing extremely severe Radiation disease has a high mortality rate, repeated vomiting, diarrhea, shock, and a sharp drop in the number of white blood cells, which can easily cause some serious skin diseases.

 

　　The well-known Curies have been working in an environment with excessive radioactivity for a long time because of the research, and they lacked protection for long-term exposure to X-rays and Y-rays, and their health was damaged.
Therefore, it is more important to monitor radioactive materials.

 

　　Harmful, radiation monitoring cannot be ignored
 

　　Radioactive radiation is divided into three categories: a kind of energy emitted by radioactive materials in the form of waves or particles is called nuclear radiation.
The detection of radioactive radiation is mainly the detection of gamma rays.
Gamma rays, also known as gamma particle streams, are the rays released during the de-excitation of atomic nucleus energy level transitions, and are electromagnetic waves with a wavelength shorter than 0.
01 angstroms.
A scintillation counter composed of a fluorescent crystal, a photomultiplier tube and an electronic instrument is a common instrument for detecting the intensity of gamma rays.

 

　　The multi-channel pulse amplitude analyzer is an instrument that measures the amplitude distribution of electrical pulse signals.
It classifies the pulse signal according to the magnitude of the amplitude and records the number of each type of signal.
It is often used to analyze the output signal of the ray detector and measure the energy spectrum of the ray.
The multi-channel pulse amplitude analyzer divides the entire analyzed amplitude range into several equal intervals (the size of the interval is called the channel width, and the number of intervals is called the number of channels), and the amplitude distribution spectrum of the input pulse can be obtained by one measurement.
Through the multi-channel pulse amplitude analyzer, not only the radiation intensity can be obtained, but also the radiation energy spectrum can be obtained.
According to different materials with different radiation energy spectrum, the radioactive element of the radiation source can be judged.  

　　In addition, radiation detectors are instruments and devices for discovering and measuring electrical radiation.
Radiation refers to the phenomenon that a part of the electromagnetic energy from the field source travels away from the field source, and then returns to the field source.
The energy spreads outward in the form of electromagnetic waves or particles (such as alpha particles, beta particles, etc.
).
Secondly, the 1,006 tons of imported zircon sand seized by the customs was attributed to the radiation detector.  

　　Extension: How should we detect whether a substance has excessive radioactivity? First, identify the external exposure level of the radiation field where the staff is located, estimate the radiation dose received by the staff, and understand the personal radiation protection situation; secondly, the nuclear energy of certain substances decays, and it is invisible to our naked eyes or not felt.
However, radiation monitoring can not be ignored for radiation that can only be detected with special instruments, and the development of related equipment can be expected.

 

　　Original title: Radioactivity exceeded the limit by nearly 7 times, radiation monitoring and detection can not be ignored