Roderick Janssen, a former church volunteer, was sentenced Thursday to 14 years in prison for a list of offences related to sexual assault and child pornography.

Janssen, 37, had earlier pleaded guilty to 18 charges including possessing and making child pornography and sexually assaulting 10 young boys from 2006 to 2011.

The youngest victim was 6-years-old.

The mother of one victim, who cannot be identified because of a court order, spoke after the sentencing.

"It wasn't long enough as far as I'm concerned. They definitely need to look at the fact, when you're piling charges on top of charges and they're only getting one set time, it shouldn't be concurrent. It should be individual."

She said child sexual abuse has become an epidemic in society.

"I thought I took every precaution I could to protect my child. I had very strict boundaries. Even though I checked and did those spur of the moment checks when my mommy instincts would tingle, it wasn't enough."

Designated a long-term offender

Janssen's child pornography collection included roughly 80,000 pictures and more than 3,000 videos.

Provincial court Judge Catherine Skene called it the largest collection of pornography of anyone prosecuted in Alberta history.

Janssen receives credit for the time he has already spent in jail, so he will spend another nine years and eight months in custody.

He has also been designated a long-term offender, which means he will continue to be supervised for 10 years after his sentence is completed.

A psychiatrist's report concluded Janssen presents a high risk to reoffend.