Radiation in life and its harmfulness

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In recent times, a group of Danish middle school students claimed that WiFi radiation affected the germination of cress seeds. This sparked public concern, prompting a reporter to consult experts who explained that the experiment lacked scientific rigor and that normal WiFi usage poses no significant health risk. This incident brought radiation into the spotlight. Beyond WiFi, questions arose: Do televisions, microwave ovens, printers, or computer screens emit harmful radiation? Could exposure to base stations near homes be dangerous? Are these everyday sources of radiation actually harmful? To explore these concerns, we spoke with several experts from both mainland China and Hong Kong. They provided insights into what radiation is, how it affects human health, and whether there's any real danger in our daily lives. Radiation can be broadly classified into two types: ionizing and non-ionizing. Non-ionizing radiation is far more common in daily life. According to Associate Professor Liang Shirong from City University of Hong Kong’s Department of Electronic Engineering, non-ionizing radiation has low energy and does not have the ability to ionize atoms or molecules, unlike ionizing radiation, which includes X-rays and nuclear radiation—both of which can be harmful at high levels. Dr. He Xiaoxia from the Institute for Environmental Studies in Darwin clarified that the term "electromagnetic radiation" typically refers to non-ionizing radiation, such as that from mobile phones, computers, and Wi-Fi routers. However, the public often confuses this with ionizing radiation, leading to unnecessary fear. Experts like Shi Taoyong from China Mobile Hubei and Guo Liping from Wuhan University confirmed that most of the radiation we encounter daily comes from non-ionizing sources. These include mobile phones, computers, microwave ovens, wireless routers, and even high-speed rail systems. On the other hand, medical procedures like X-rays and CT scans involve ionizing radiation, which is much more dangerous if exposure is excessive. When it comes to health risks, non-ionizing radiation is generally considered safe. Zhao Yufeng, an expert at the National Indoor Environment and Indoor Environmental Product Quality Supervision and Inspection Center, explained that as long as the measured radiation levels are within the safety limits set by China’s “Electromagnetic Radiation Protection Regulations,” there is no cause for alarm. Professor Li Liyun from the University of Hong Kong’s Li Ka Shing Faculty of Medicine emphasized that non-ionizing radiation has very low energy and cannot cause harm under normal conditions. She also noted that there is no scientific evidence showing that such radiation leads to cancer, birth defects, or genetic mutations. Some people worry about the cumulative effect of multiple devices operating simultaneously. However, experts clarify that radiation from different sources doesn’t simply add up like numbers on a calculator. The Hong Kong Environment Bureau stated that no international studies have found that using multiple household appliances together poses a health risk. Concerns about large-scale infrastructure like telecom base stations and power substations were also addressed. According to the Hong Kong Communications Authority, the electromagnetic fields generated by these facilities are low-energy and well within safety limits. In fact, Hong Kong, which has over 26,000 base stations, has not seen any increase in cancer rates linked to such radiation. Experts also pointed out that before building large-scale equipment, environmental impact assessments are conducted to ensure that radiation levels remain safe. Data from China’s 2012 State of the Environment Bulletin supports this, showing that radiation levels around transmission lines and base stations are below established safety standards. For those worried about high-speed rail radiation, experts reassure that it emits low-frequency electromagnetic waves, and the exposure inside trains is minimal. Tests conducted by Liang Shirong’s team on the Hong Kong subway confirmed that radiation levels are well within international safety guidelines. Finally, many so-called “radiation protection” products on the market—like anti-radiation vests or special plants—are largely ineffective and based on marketing hype. Experts agree that while it’s wise to take reasonable precautions, there’s no need to panic. Simple steps like keeping devices at a distance, using wired headphones, and choosing certified electronics can help reduce unnecessary worry. In conclusion, non-ionizing radiation is a part of modern life, but it’s not inherently dangerous. A balanced, informed approach is key—neither ignoring nor overreacting to its presence.

Optical Dissolved Oxygen Sensor

Overview

An optical Dissolved Oxygen Sensor, also known as an optical DO sensor or luminescent DO sensor, is a high-precision device used to measure the concentration of dissolved oxygen (DO) in water. Unlike traditional electrochemical sensors, optical DO sensors utilize fluorescence-based technology for stable and maintenance-free operation. Known for their long-term reliability, these sensors are widely adopted in industrial, environmental, and aquaculture applications. This article will explore what dissolved oxygen is, how optical DO sensors work, their practical applications, and why Daruifuno optical DO sensors are the right choice for your water quality monitoring needs. 

Optical Dissolved Oxygen Sensors
 

What Is Dissolved Oxygen and Why Is It Important?

Dissolved oxygen (DO) refers to the amount of free, non-compound oxygen present in water. It is one of the most critical indicators of water quality, as it directly affects the health and survival of aquatic organisms. Proper DO levels are vital in aquaculture systems, wastewater treatment, and natural ecosystems. 

Monitoring DO helps prevent fish kills, optimize aeration energy usage, and maintain compliance with environmental regulations. In industrial processes, low DO levels can indicate contamination or biological imbalances that may hinder system efficiency. 

 

How Does an Optical DO Sensor Work?

Optical DO sensors work on the principle of fluorescence quenching. The sensor's cap contains a luminescent dye that is excited by a blue light source. When oxygen molecules are present, they interact with the dye and reduce its fluorescence intensity or change the decay time. 

The sensor measures this change to determine the concentration of dissolved oxygen accurately. Unlike electrochemical sensors, optical DO sensors do not consume oxygen during measurement, resulting in: 

  • No need for electrolyte or membrane replacement
  • No flow dependence or stirring required
  • Lower maintenance and longer service intervals
  • Stable performance over long-term deployments
 

Applications of Optical Dissolved Oxygen Sensors

Aquaculture

Maintaining optimal DO levels is essential in aquaculture to promote fish health and improve production efficiency. Daruifuno optical DO sensors provide real-time data to support precise oxygen control. 

Wastewater Treatment

In wastewater treatment plants, DO is critical for the biological breakdown of pollutants. Reliable monitoring helps optimize aeration control and reduce energy costs. 

Environmental Monitoring

Researchers and environmental agencies use DO sensors to assess water quality in rivers, lakes, and oceans. Optical sensors are ideal for long-term field deployment in remote or harsh environments. 

Industrial and Laboratory Use

Optical DO sensors are used in laboratories, food & beverage production, fermentation processes, and other industrial water systems where DO monitoring is vital. 

 

Why Choose Daruifuno Optical Dissolved Oxygen Sensors?

At Daruifuno, we are committed to providing high-performance water quality monitoring solutions. Our optical dissolved oxygen sensors stand out for their: 

  • Exceptional accuracy and rapid response times
  • Low maintenance design with no consumable parts
  • Durable housing for harsh environments
  • Multiple output options including Modbus/RS485 and analog
  • Customizable integration for various monitoring systems

Our sensors are trusted by customers worldwide in aquaculture, wastewater management, and environmental research. 

 

Conclusion

Optical dissolved oxygen sensors are transforming the way we monitor water quality by offering accuracy, stability, and low-maintenance performance. Whether in aquaculture ponds or wastewater treatment plants, Daruifuno delivers dependable solutions for every application. 

Looking for more dissolved oxygen measurement options? Browse our  full Dissolved Oxygen Sensor category » 

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Suzhou Delfino Environmental Technology Co., Ltd. , https://www.daruifuno.com