WASHINGTON — Producers of sexually explicit material must be able to prove the subjects depicted in their photographs and films are adults, according to new government regulations approved Tuesday by Attorney General Alberto Gonzales.

To implement a government crackdown, Gonzales signed final rules that establish detailed procedures for inspecting pornography producers’ records to ensure children aren’t being used as performers in sexually explicit depictions.

Pornography producers who violate the new requirements would be subject to prison terms of up to five years on the first offense and up to 10 years for subsequent offenses.

Porn producers must keep detailed records that verify the identity and age of each individual depicted. The new regulations, to be published in the Federal Register, also update the definition of “pornography producers” to include producers of visual depictions of sexually explicit conduct published on the Internet.

The regulations implement recent congressionally-approved amendments to the Child Protection and Obscenity Enforcement Act, which President Bush signed into law in 2003.