Top 20 smartphones with the highest and lowest radiation

Published 23.04.2024 | By Йосиф

Top 20 smartphones with the highest and lowest radiation

Several factors contribute to lower emission levels than test SAR values

Use smartphones wisely and cautiously to avoid potential health risks from their radiation (photo: CC0 Public Domain)

Cell phones have become an indispensable part of our daily lives, despite concerns about potential health effects from the radiation emitted by these devices. A crucial metric for understanding the radiation of phones and their impact on the human body is the so-called specific absorption coefficient (SAR). On its basis, a safety rating of mobile phones can be compiled.

The radiation from mobile phones falls into the non-ionizing range of the electromagnetic spectrum. Unlike ionizing radiation (X-rays, gamma rays), which can damage DNA, non-ionizing radiation does not have enough energy to directly break molecular bonds. However, this radiation can be absorbed by tissues, leading to a potential heating effect.

Demystifying the SAR Index

The SAR index quantifies the rate at which radio frequency (RF) energy emitted by phones is absorbed by human tissue. It is expressed in watts per kilogram (W/kg) and reflects the average amount of power deposited per unit mass of tissue within a certain volume.

Regulatory bodies around the world, including the European Union (EU), establish maximum SAR values to ensure the safety of mobile phones.

SAR measurement and regulation

The SAR value that the mobile phone manufacturer gives is the highest measured value obtained under standardized testing conditions. These tests usually involve placing the phone in close proximity to a phantom – a tissue-simulating material – and transmitting at maximum power. Multiple measurements are taken at different positions around the phone and the highest value is used as the reported SAR. This approach provides a conservative estimate of potential exposure under real conditions.

The EU, for example, has set separate maximum SAR values for the whole body (0.08 W/kg) and for a part of the body (head: 2 W/kg). These limits are set well below the levels at which significant thermal effects have been observed. In addition, the SAR measurement takes into account a 10-gram mass of tissue averaged over a 6-minute interval, which reflects a realistic scenario of continuous exposure to radiation from the phone.

Top 20 mobile phones that emit the most (SAR)

Top 20 mobile phones that emit the least (SAR)

Real-world SAR considerations

It is important to understand that the SAR index reported represents the worst case scenario. In daily use, several factors contribute to lower actual exposure levels compared to tested values:

Network signal strength: A strong network signal implies lower power transmission from the phone, resulting in a reduced SAR. Conversely, weak signal conditions require a higher output power from the phone to maintain the connection, potentially resulting in a slightly higher SAR.

Distance: RF radiation intensity follows the inverse square law. Doubling the distance between the phone and the body reduces the SAR four times. This principle emphasizes the benefit of using a headset or speakerphone to keep the phone away from the head during calls.

Usage patterns: Most users do not hold their phones to their head for extended periods of time. Additionally, phone calls typically involve intermittent talking and listening, which further reduces average exposure levels compared to the continuous transmission simulated during testing.

SAR and mobile phone safety: the evidence

Extensive research has been conducted on the potential health effects of cell phone radiation. While some studies suggest possible links to certain health conditions, the evidence remains inconclusive.

Reputable international organizations such as the World Health Organization (WHO) have classified radio frequency fields from mobile phones as “possibly carcinogenic to humans” based on limited evidence. This classification indicates a potential risk, but does not confirm a causal relationship.

Responsible use and regulatory measures

Given current research, it is wise to take a cautious approach to smartphone use. Here are some tips to minimize potential exposure:

Use a speakerphone or headphones: This increases the distance between the phone and the head, significantly reducing SAR.

Text instead of calling: Texting eliminates the need to hold the phone to your head. Limit long conversations: Shorter conversations reduce overall radiation exposure.

It is important to emphasize that mobile phone manufacturers are subject to strict safety regulations. The reported SAR value serves as confirmation that the device meets established safety standards.

After all, focusing solely on the SAR index when choosing a mobile phone may not be the most effective approach. It’s more important to make sure your chosen device adheres to regulatory requirements, and to adopt responsible phone usage practices to minimize potential exposure.

The SAR index plays a role in ensuring the safety of mobile phones. By understanding this metric and the factors affecting radiation exposure in real-world use scenarios, you can make an informed choice.

Continued research will further enrich the understanding of the potential health effects of RF radiation. However, following responsible usage practices and using regulatory safeguards provides a solid framework for safe cell phone handling.
Tips and tricks to minimize your cell phone radiation exposure

While the SAR index offers valuable information, here are some practical tips and tricks you can implement to further reduce your exposure to cell phone radiation:

Network and signal strength

Prioritize strong network areas: When possible, talk and use data services in areas with a strong signal. This reduces the power your phone has to transmit, resp. reduces SAR.

Airplane mode in weak signal areas: If you are in a weak signal area (eg rural areas, elevators), consider switching your phone to airplane mode. This disables cellular transmission completely, eliminating radiation exposure. Be sure to re-enable cellular data or Wi-Fi when you return to an area with a strong signal.

Distance

Speakerphone or headphones: Use a speakerphone or wired headphones whenever possible during calls. This increases the distance between the phone and your head, significantly reducing SAR. While Bluetooth headsets offer some advantage, wired headsets eliminate the extra radiation from Bluetooth connectivity.

Wearing strategy: When not using the smartphone, avoid wearing it directly on your body. Put the phone in a bag or backpack instead. This will minimize continuous close contact of the device with the body.

User habits

Keep conversations short: The longer the conversation, the greater the overall exposure. Consider sending text messages or using instant communication apps, reserving calls for situations that require a long conversation.

Nighttime considerations: If you’re concerned about potential sleep disruption, keep your phone away from bed at night. Turn it off completely or switch to airplane mode to eliminate radiation while you sleep.

Additional considerations

Research different phone models: While focusing solely on SAR may not be the best approach, some web resources allow you to compare the SAR values of different phone models. This information can be a factor when choosing a new phone, but prioritize models that meet regulatory standards.

“Third Party” Accessories: Be cautious, research the market for radiation shielding phone cases or bags. However, beware of unsubstantiated claims and prioritize reputable brands with verifiable test data. Remember that responsible usage habits remain the most effective approach.

And remember:

These tips and tricks are meant to provide extra levels of safety. Regulatory bodies have established standards, and phones that adhere to them are generally considered safe for everyday use. By implementing the listed strategies and maintaining a balanced approach, you can enjoy the benefits of mobile technology while minimizing the potential risks.

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