I hate to inject (infuse?) some science into this but since the liquid is injected into the pulp of the melon and is absorbed isotropically by capillary action, there would be no line of demarcation between different linear attenuation coefficients, and electromagnetic emissions, whether x-ray or gamma ray, would not be able to discriminate between substances. Now if you didn't want to use the time honored method of using a syringe to infuse, and simply hollowed out a part of the melon, half value layers might change enough to show a shadowing. If you're really serious about the subject, the attenuation coefficient follows the Beer-Lambert law. And note, it's not the Vodka-Lambert Law. But it works for that, too.
If you want to confirm methodologies for successful melon infusion, check with the guys at Sigma Phi Epsilon at UTSA.