What is the manufacturer's recommended minimum
Also see: "Do iPhones emit more radiation than
Samsung Galaxy phones?"
- When communication is unnecessary, use Airplane mode.
- When using cellular, turn off Wi-Fi and Bluetooth.
- When using Wi-Fi, turn off cellular and Bluetooth.
- When phone is powered on, never keep phone next to your body, especially during a phone call.
- When communicating, use phone in speaker mode or a wired earpiece. Only make calls when signal is strong (4-5 bars).
According to test reports filed with the Federal Communications Commission (FCC), the Specific Absorption Rate (SAR) for the Galaxy S9 for cellular transmission is 0.34 watts per kilogram (W/kg) at the head, and 0.93 W/kg when worn on the body. The WiFi hotspot SAR is 0.75 w/kg. The SAR for simultaneous transmission (cellular plus Wi-Fi) is 1.25 W/kg at the head, 1.39 W/kg when worn on the body, and 1.52 W/kg when used as a hotspot. (1)
All SARs reported above are averaged over one gram of body tissue corresponding to the U.S. standard. The SARs may vary depending upon your specific cell phone carrier.
The SARs for the Apple iPhone X and iPhone X Plus were obtained at a separation distance of 5 mm (about 0.2 of an inch) from the body so the body-worn SAR values are not comparable to those reported for the Samsung phones. The iPhone SAR values can be found in my article on Apple Iphones.
The FCC ID numbers for the Galaxy S9 are A3L SMG960U, 960U1, and 960W and 960SU, and for the S9 Plus they are A3L SMG965U, 965U1, and 965W, and 965SU. The SAR values for these smart phones can be found on the FCC website: https://www.fcc.gov/oet/ea/fccid.
For tips on how to reduce exposure to wireless radiation, see "Some Tips to Reduce Your Exposure to Wireless Radiation". (18) In short, limit your use of the phone, keep the phone away from your body whenever it is powered on, use the phone hands-free, and turn off transmitters not in use (e.g., shut off Wi-Fi or use airplane mode).
(2) PCTEST Engineering Laboratory, Inc. SAR Evaluation Report. Samsung Electronics Co., Ltd. FCC ID: A3LSMG965U. Date of Testing: 12/20/2017 to 1/9/2018. https://fccid.io/A3LSMG965U/RF-Exposure-Info/RF-Exposure-Info-1-3288005
(7) Environmental Working Group. EWG’s Guide to Safer Cell Phone Use: Where is EWG's cell phone database? August 27 2013.
(17) Joel Moskowitz. Brain Tumor Rates are Increasing in the U.S.: The Role of Cell Phone and Cordless Phone Use. http://bit.ly/risingtumors
(18) Joel Moskowitz. Some Tips to Reduce Your Exposure to Wireless Radiation (one page handout). Undated. http://bit.ly/saferemrtips3