Henry, before you read this, understand that it’s not a personal attack on you. It’s intended to educate the population that may not know better.
In the real world, there are more CFR’s that employers have to satisfy than just 10CFR20. If a newer standard comes out, then the newer standard has to be adhered to.
Riddle me this...
Tossing NANTel out for a second....
A protection factor of 50 is more conservative than 100, correct?
So saying that 100 is MANDATED, might be a bad choice of words. It isn't really MANDATED, it's ALLOWED. As 50 is more conservative.
I've been to stations that used 50 POST 1999 10CFR20 changes because it’s in their procedures and it’s more conservative. Not to mention that there are also some additional requirements to meet the 100 PF, that is not required to take credit for 50.
By the way, just so you know, NIOSH and OSHA are more of an authority on the use of respirators; both have NEWER standards (2006) and use 50 PF, not 100. So MANY MANY MANY places use 50. Be prepared to flunk a test if you think the answer is always 100. OSHA and NIOSH deal with more than just rad issues, and most respirator programs deal with more than just rad issues.
For OSHA… Read 29 CFR 1910.134, it states 50.
http://www.osha.gov/pls/oshaweb/owadisp.show_document?p_id=12716&p_table=standardsAnd look at this page, what credit do they take for their FFNP APR?
http://www.oltrain.com/14_RPE.html#Air-Purifying%20RespiratorsTable of OSHA & NIOSH PF’s:
http://www.ehso.com/RespProtectionSelection.htmHere is OSHA’s November 22, 2006 “29 CFR Parts 1910, 1915, and 1926, Assigned Protection Factors; Final Rule”, it states 50. Something about “Final Rule” tells me that 50 is MY final answer if I’m creating a respirator program (And I have.)
http://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=FEDERAL_REGISTER&p_id=18846 I understand that the old 1999 10CFR20 Appendix A, Assigned Protection Factors for Respirators (
http://www.nrc.gov/reading-rm/doc-collections/cfr/part020/part020-appa.html) States 100. I also understand that the questions in our database are 20 years old, and that we are lucky they talk about DAC and not MPC.
I have a much, much better database of questions for the website, but I do not have the time to enter them into the computer.
Summary: I don’t know what is on the NANTeL test, and I don’t know what every station uses for a Pf. I do know that in 20 years, I’ve see it both ways, and that 50 is better, and it’s what OSHA & NIOSH’s FINAL ruling on the mater states, and they are more recent rulings than the 10CFR20 you quoted.