Neutrons are extremely sensitive to small amounts of water. To quantify and calibrate this sensitivity we use known thicknesses of water and measure this effect directly. Using a wedge of water formed by incrementally milling steps in a block of aluminum a well known range of steps are formed from 0.050 mm to 2 mm in increments of 0.050 mm. Radiographs of the wedge when wet and dry can be compared to yield the water steps alone. From this the sensitivity of the method can be shown.
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