Having been on a HAZMAT team.
And worked in radiation safety.
jdintex is closest so far.
First off, no suit can protect against Gamma or Neutron radiation. You need a lot of mass for these.
The main protection from "rad" is radioactive contamination protections, especially inhaling rad. HEPA filters are standard.
HAZMAT comes is levels, but respiratory is the key. The big plastic bubble suits contain SCBA are Level A. These last about 30 minutes. There are some liquefied O2 re-breather systems that may last longer, but not commonly used. Also Fire Fighters use the same SCBA as HAZMAT.
The rest is filtered air. Powered filters put much less strain on the user. Almost all mask type filters are HEPA and then some have chemical cartridges. But you need to know what class of chemical in advance. The more you protect from the more difficult it is to draw a breath through. All clog in time. If you are active, 8 hours is a long lifespan for a filter. In HAZMAT this is Level B, and all the NBC suits I have seen are also just filter masks. Without a visor is a "half-mask" is often called Level C.
Now lets move to skin contact. Level A and NBC are equal in protecting against: Chem vapor, BIO agents, contact with chemicals, and all radiations. The ones I have examined (some 20 years ago) use the same outside layer. However, typical HAZMAT level A is really just one layer, while very tough, if punctured, only the air escaping keeps stuff out. Expected life in use is a few hours, assuming you have a clean zone to swap out the SCBA tanks. The NBC I had is multi layers, with things like activated carbon in between layers. I assume the idea is these suits are long duration, days. They are not airtight like Level A, but a rip or puncture still allows it to be resistant to agents. But clearly will degrade with use.
To sum up HAZMAT level A is like 99% for 1/2 hour.
NBC is like 90% for a few days.