Can UV-C or any other commercially viable type of UV Ray penetrate tissue of agricultural products such as coconut meat or copra?

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Martin Graupner

UV rays do not have any penetration power to opaque surfaces. The shorter the wavelength respectively the higher the energetic level of UV rays, the lower the penetration capability. E.g. UV-A rays do have a much higher penetration power compared to UV-C rays. I attached a good explanation from our web. Even though it is in German you'll understand it."Haut" does mean "human skin".

Darcy de Asis

Thank you for the answer Mr. Graupner! So is it safe to assume that disinfection of opaque objects using UV-C rays is only superficial?

Very short answer: Yes!