Recently I scored quite the haul of new industrial half and full face mask North respirators and cartridges. I'm very ignorant about these devices and certainly could benefit from those who know more than I do! For preparedness I would think having access to these would be beneficial. Also with the looming concerns about Nuke, Biological, and Chemical (NBC) possiblities - having the capabilty of outfitting my family and circle of trust with these might behoove me. What I inherited are mostly North Half Masks in the 7700 series and a number of the North 7581P100 combo cartridges which I understand work effectively against most Organic Vapors such as chlorine, hydrogen chloride, & fluoride, sulfur dioxide et al. I also have a few of the North 75SCP100 which is considered the "Defender Multi-Purpose" cartridge and the N7500-1 cartridge. I do know how to fit myself with a respirator as I've been trained and qualified for "Fit testing." I've been through the class on fit testing and have tested others. So I'm semi-competent in wearing and fitting myself and family with these devices. Where I have a gap is knowing what cartridge to wear with what - under what conditions. I realize respirators are not Gas Mask so they will not work or cannot work with CN/CS and OC. But for a disaster such as an overturned train or tractor/trailer spilling industrial chemicals such as organic vapors I know they'll work fine. But what happens if we have a flu outbreak, release of small pox or other biological situation? What I'd like to know is can I purchase a cartridge to protect myself from Nuclear and/or Biological? And if so which cartridge(s)? From my novice research is appears what I really need is a Gas Mask using either the North 40CBRN or the 40RCP100 canisters which are for the North gas mask. It says these are for NBC. If so which cartridge would be most advised? And assuming I"m asking too much from this North 7700 series then I guess I can just keep these in the truck in the event I come across a train or truck wreck involving a spill. I'd be really appreciative if someone with a background in this technology and devices would weigh in here and provide me/us with Respirator 101!