The World Health Organization says it has not been proved that they reduce radiation from cellphones.
The government has come under pressure to abandon those promises amid evidence that attempts to reduce radiation to its target of 1 millisievert a year are failing.
Dr. Lee W. Graber, president of the American Association of Orthodontists, praises the technology and said dentists have worked to reduce radiation over the years.
Recently he took Mr. Tao, the visiting physicist, to a nearby mountain to test the effectiveness of removing dead leaves from the ground to reduce radiation levels.
She is a tireless worker, advising people how to check radiation levels and constantly researching ways to make food safe and clean, including organic gardening and promoting the humble earthworm, which can amazingly reduce radiation levels.
Cardiologists hired by the companies offered short briefings on ways to reduce radiation doses, while sales representatives in business suits quietly talked up the benefits of the scans and the clarity of the images.
The iodine pills, which help reduce radiation build-up in the thyroid, would be given first to children under 18 and pregnant women living within a 100-kilometre (62-mile) radius of a plant, health ministry spokeswoman Edith Schippers said.
We sought to systematically reduce radiation exposure during pediatric ureteroscopy.
On 11 May, it released suggestions for removing contaminated topsoil from schoolyards to reduce radiation exposures.
Filling and assembly should be uncomplicated to reduce radiation exposure when preparing the phantom.
Iterative CT reconstruction can improve image quality and reduce radiation dose.
