Absorption specific rate (SAR)
The SAR of RF protective clothing is a measure of how well a particular piece of clothing can absorb electromagnetic radiation. It is measured as Specific Absorption Rate (SAR) which is based on ANSI standards. The actual amount of reduction in SAR will depend on the field exposure of the wearer and the particular characteristics of the protective garment. So, the wearer must assess the effectiveness of the radio frequency protective clothing prior to purchasing.
In both rat and human models, SAR is measured as the average of SAR over a 10-g volume of tissue. For this reason, the averaging time is six minutes for frequencies lower than three GHz and 10 GHz and ten GHz, respectively. However, the rationale for using such a long-term average isn't evident.check it outrecommended an interval of 0.1 h. However, this is not an adequate measure because it implies a lower level of precision.
The impact of the washing process on SAR
Chemical compatibility is typically tested using a test called the permeation breakthrough period. This test determines the amount of chemical permeation through a particular material and is dependent on the chemical concentration, material thickness and the temperature, pressure, and humidity. The test is typically performed on a sample of a material in a concentration of 100% over an extended period of exposure. If the duration of the breakthrough is greater than one hour, the substance is considered acceptable. However, temperature effects can drastically reduce the barrier properties that protect clothing.
The outcomes of the assessment should be provided to the end users and upper management as needed. The findings should be utilized in protective equipment and clothing SOPs and applications, which must be based on the elements that are discussed in this section. Particularly the SOPs and application must include decision trees that link chemicals and levels of protection.
Biological effects of RF radiation
There are still a few unanswered concerns regarding the biological effects of radiofrequency radiation (RFR). Scientists have carried out epidemiological studies of EMF exposures and health risks. However, most studies have concluded that there are no adverse health effects can be attributed to RF exposure. Further research is required to determine the effects on biological systems of RFR.
RFR may trigger a thermal response in living cells that can modify the properties of dielectric molecules. The thermal response may change the biochemical pathways that are present in living organisms. According to research, an absorption rate greater than four W/kg can enhance the temperature of living cells by approximately 1.25 degrees Celsius. But the effect can be triggered by time.
However, some studies have demonstrated that RF radiation is associated with increased risks of cancer. Two studies, carried out through researchers from the National Toxicology Program (NTP) and Ramazzini Institute (ICNIRP), have proven that mice and lab rats who are exposed to high amounts of RF energy may increase their risks of developing cancer.
