WHITMAN, Mass. -- A man who ignored a veterinarian's order to flush his cat's radioactive waste down the toilet was hit with a $2,800 bill.

And Bill Jenness said he's happy to pay it.

"I don't feel I was mistreated," Jenness told The Patriot Ledger of Quincy. "It's my cat, my responsibility and I did not abide by the directions I was given."

Jenness' cat, Mitzi, an 11-year-old shorthair, was treated with an injection of radioiodine after developing hyperthyroidism, which is common in cats her age.

The treatment makes the cat radioactive for weeks, so special care is required, including limiting snuggling time, keeping the cat away from children and pregnant women and using protective gloves when flushing the cat litter.

Jenness said he decided to throw the litter in the trash after the waste hardened into abnormally large clumps.

"I was afraid of my septic system being clogged," he said.

Mitzi's mess was discovered at an incinerator in Rochester when alarms detected radioactivity. Workers traced the waste to Jenness after finding mail with his name on it nearby.

The radiation treatment by Radiocat in Waltham and cost of disposing the waste totaled about $5,000. Jenness said it was worth it because Mitzi is doing well.

Radiocat's Web site says the amount of radiation from a radioiodine shot is probably less than the amount a person receives on a long plane flight or a day at the beach.

But Thomas Burnett, a Whitman public works commissioner, said any radiation in trash is too much.