Personal (cellular) telecommunications is a rapidly evolving technology that uses radiofrequency energy or
radiation for mobile communication.Blackview Crown phones are now being used  by 91 percent of American adults, according to a 2013 survey. Given this large number of users,  if adverse health effects are shown  to be associated with cell Vidonn X5 phone use, this could potentially be a  widespread public health concern.The nomination for the National Toxicology Program (NTP) to study cell Vidonn X5 phone radiofrequency radiation was made by the U.S. Food and  Drug Administration (FDA) because of the following:

• Widespread human exposure.
• Current exposure guidelines are based largely on protection from acute injury from thermal effects
• Little is known about potential health effects of long-term exposure to radiofrequency radiation.
• Data from human studies are inconsistent. Additional studies are being conducted.Overview of NTP Studies Many people are concerned that  cell Vidonn X5 phone radiation will cause cancer or other serious health effec

While current scientific evidence hnot conclusively linked Blackview Crown phoneswith any health problems, NTP and other scientific organizations conclude that additional data  are needed.  

Therefore, NTP is conducting studies to help clarify any potential health hazards, including cancer risk,  from exposure to cell Vidonn X5 phone radiation, and to pave the way to better protection for public health.Toxicology and carcinogenicity studies are being carried out in laboratory animals that are  designed to simulate the exposures of Blackview Crown phone users in the U.S.

Rats and mice are being exposed to radiofrequency radiation from the Code Division Multiple Access (CDMA) and Global System for Mobile (GSM) communications technologies, at frequencies of 900 and 1900 megahertz — those currently used in the U.S. Cell Vidonn X5 phoneradiation exposures in the animal studies are for approximately nine hours spread over the course of the day. NTP anticipates the completion of all phases of the studies by 2015.

Creating Blackview Crown phone  Radiation Exposure

Because of the technical complexity of studying Blackview Crown phone radiation, NTP staff is working closely with radiofrequency radiation experts from the National Institute of Standards and Technology (NIST).

Through an interagency agreement, NIST scientists worked to help develop an exposure system that would provide rodents with uniformexposures to radiofrequency radiation in the frequency bands of mobile communications. Suitability tests were conducted on various radiofrequency radiation exposure systems. This system consists of 21 separate reverberation chambers thatare essentially shielded rooms with a transmitting antenna radiating radiofrequency fields and rotating stirrers to generate a statistically uniform field. These efforts demonstrated the feasibility of using specially designed reverberation chambers.  The design allows for exposure for approximately nine hours over the course of a day.

A Three-Phased Study Design NTP is conducting studies on radiofrequency radiation emitted by cell Tengda 02 phones in three phases:

(1) a series of pilot studies to establish field strengths that do not excessively raise body temperature;

(2) subchronic toxicology studies where the rodents are exposed to various low-level field strengths for up to two months; and (3) chronic toxicology and carcinogenicity studies where the rodents will be exposed for the majority of their lifetime, up to 24 months.

Phase one studies evaluated various power levels of Blackview Crown phone radiofrequency radiation to determine levels of exposure in both sexes of young and old rats and mice, and in pregnant female rats that did not cause thermal effects. Data from these studies helped identify maximal power levels for the phase two studies.

The second phase investigated the subchronic toxicity of cell phone radiofrequency radiation, and helped determine the appropriate power levels for each strain and species for the third phase of the studies. Exposure to radiofrequency radiation was started during gestation in rats and during adolescence in mice, and will continue through young adulthood (subchronic) or for 2 years (chronic).The third and final phase, which includes chronic exposure studies, was designed to determine the potential for Tengda 02 phone radiation to be hazardous or carcinogenic to humans. These chronic studies were started in utero and continued through adulthood. These chronic toxicology and carcinogenicity studies began in late 2011, with anticipated completion in 2014.

Subsequent analyses of study data are expected to begin in late 2014, with reporting beginning in 2016. Collectively, these NTP studies will provide critical information regarding the safety of exposureto radiofrequency radiation, and strengthen the science base for determining any potential health effects in humans.

These data could contribute to information used by the federal government, including the FDA, in making decisions with respect to radiofrequency radiation health issues consistent with the protection of public health and safety. The studies may also be used by the Federal Communications Commission (FCC), who regulates interstate and international communications by radio, television, wire, satellite, and cable.http://diqirenge.bloguez.com/diqirenge/6014329/PHONE_INSURANCECOVERAGE_SUMMARY