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Exploiting this property is extremely useful in that access need only be to one side of the vessel.  This makes it very quick.  It is also accurate with a tolerance typically ±1 inch.

The neutron backscatter technique not only determines liquid/vapor and solid vapor interfaces, but also in some instances, successfully locates liquid/liquid and liquid/solid interfaces.  Typical applications include:

• Determining liquid in distillation column downcomers and draw pans
• Level measurements during service or repair of installed gages.
• Calibration of nucleonic or conventional level gages on storage tanks, spheres, and tank cars.
• Measurements of levels in vessels not requiring monitoring such as knock out pots and heat exchanger shells
• Locating sludge levels in the bottom of tanks