Method and apparatus for acoustically monitoring neutron flux ra

Details Method and apparatus for acoustically monitoring neutron flux ra Method and apparatus for acoustically monitoring neutron flux ra

1975-01-29

1976-11-09

Willis, Davis L.

Radiant energy

Invisible radiant energy responsive electric signalling

Neutron responsive means

250391, G01T 300

Patent

active

039913139

ABSTRACT:
A neutron flux radiation detector is provided that utilizes neutron radiation induced nonlinear acoustic behavior in water, with the resultant mixing of two ultrasonic signals in transit through the liquid, to provide a measure of ambient radiation levels. Nonlinear elastic properties are imparted to the water by the presence of microcavities which are formed when high-energy neutrons collide with the waters atomic nuclei.
The detector employs an ultrasonic transmitting transducer which is driven simultaneously at two different frequencies. The acoustic output is transmitted through a container housing a pool of distilled water. Only when radiation is present will the acoustic signals in transit through the water undergo harmonic distortion and "mix", thereby generating sum and difference frequencies. These sum and difference frequencies are then sensed using a separate receiving transducer, and are identified as a measure of the ambient radiation level.

REFERENCES:
patent: 2926261 (1960-02-01), Truell et al.

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