natural background การใช้

• A small natural background flux of free neutrons exists everywhere on Earth.
• This is essentially a natural background flux of water from the lake.
• The area is known for its relatively high levels of natural background radiation.
• These mutations build up naturally in all of us from natural background radiation,
• The natural background load for a pollutant may be imprecisely understood.
• This includes both offsite " natural background radiation " and any medical radiation doses.
• Subsequent investigations have found no increase in the natural background radiation in the area.
• Most human exposure to radiation comes from natural background radiation.
• It is 200m long with clear water and natural background.
• Even natural background levels of ozone exceed the legal limit.
• That's the same amount most people receive each day from natural background sources, she said.
• It is very hard to uniquely identify neutrino interactions among the natural background of radioactivity.
• Furthermore, there is very little solar or other natural background radiation in the microwave spectral region.
• The global extinction rate may be approximately 1, 000 times higher than the natural background extinction rate.
• During his childhood, Pierre was very sensitive to the sounds of the natural backgrounds he evolved within.
• "It's very difficult to isolate seismic signals from this type of test from natural background seismic noise,"
• He called the new ozone limit " virtually unattainable " because of the natural background level of ozone.
• Accumulations in the soil, vegetation, and surface runoff have not been large enough to measure above natural background.
• The idea was dismissed, however, as it would interfere with plans to measure the Moon's natural background radiation.
• "It would be too diluted to distinguish from natural background uranium in the sea water, " she said.