природний фон іонізуючого випромінювання / природний радіаційний фон
background radiation
Galactic Radiation and Background (GRAB)
natural and man-made
natural concealment
natural disaster
natural features
natural forward position
natural obstacle
natural respiratory pause
natural dangerous factors
develop a natural obstacle
surveillance by natural vision
compressed natural gas (fuel) (CNG)
background information
background noise
background check
universal background checks
background sound pressure level
final background sound pressure level
background
background count
background counting rate
background investigation
background map
personal background
cluttered background
Blink background
acute radiation dose
alpha radiation
anti-radiation missile (ARM)
beta radiation
counter-neutron radiation screen