In radiography, contrast is improved by using __________ energy levels.

In radiography, contrast is significantly enhanced by using high energy levels. High energy levels penetrate materials more effectively, which allows for better differentiation between various densities within the object being inspected, resulting in a clearer image with greater contrast. This increased penetration helps in highlighting imperfections or variations in density, thus facilitating the detection of flaws within welds and other structures.

While lower energy levels may lead to images with diminished detail or contrast due to increased scatter radiation, moderate or variable energy levels might not provide the consistent clarity necessary for optimal image interpretation. Ultimately, the use of high energy levels is crucial for producing radiographs with superior contrast.