|
Operating Mode
|
Assigned Protection Factors
|
|
I. Air purifying respirators
(Particulateb
only)c
|
|
Filtering faceplate
disposabled..........
|
Negative Pressure.............
|
(d)
|
|
Facepiece, halfe
......................
|
Negative Pressure.............
|
10
|
|
Facepiece, full
.......................
|
Negative Pressure.............
|
100
|
|
Facepiece,..........................
|
Powered air-purifying respirators
|
50
|
|
Facepiece, full
.......................
|
Powered air-purifying respirators
|
1000
|
|
Helmet/hood........................
|
Powered air-purifying respirators
|
1000
|
|
Facepiece, loosefitting
................
|
Powered air-purifying respirators
|
25
|
|
II. Atmosphere suppling respirators
|
|
(Particulate, gases, and
vaporsf)
|
|
1: Air-line Respirator:
|
|
Facepiece, half
......................
|
Demand....................
|
10
|
|
Facepiece, half
......................
|
Continuous Flow.............
|
50
|
|
Facepiece, half
......................
|
Pressure Demand.............
|
50
|
|
Facepiece, full
......................
|
Demand....................
|
100
|
|
Facepiece, full
......................
|
Continuous Flow.............
|
1000
|
|
Facepiece, full
......................
|
Pressure Demand.............
|
1000
|
|
Helmet/hood........................
|
Continuous Flow.............
|
1000
|
|
Facepiece, loose-fitting
...............
|
Continuous Flow.............
|
25
|
|
Suit...............................
|
Continuous Flow.............
|
(g)
|
|
2: Self-contained breathing apparatus
|
|
(SCBA):
|
Demand....................
|
h100
|
|
Facepiece,
full.....................
|
Pressure Demand.............
|
i10,000
|
|
Facepiece,
full.....................
|
Demand, Recirculating.........
|
h100
|
|
Facepiece,
full.....................
|
Positive Pressure Recirculating..
|
i10,000
|
|
Facepiece, full .....................
|
|
III. Combination Respirators:
|
|
Any combination of air-purifying and
atmosphere-supplying respirators
|
Assigned protection factor for type and mode of
operations as listed above
|
FOOTNOTES
a. These
assigned protection factors apply only in respiratory protection program that
meets the requirements of 105 CMR
120.293:
Appendix A. They
are applicable only to airborne radiological hazards and may not be appropriate
to circumstances when chemical or other respiratory hazards exist instead of,
or in addition to, radioactive hazards. Selection and use of respirators for
such circumstances must also comply with Department of Labor regulations.
Radioactive contaminants for which the concentration values in
105
CMR
120.296:
Appendix B,
Table 1, column 3 are based on internal dose due to inhalation may, in
addition, present external exposure hazards at higher concentrations. Under
these circumstances, limitations on occupancy may have to be governed by
external dose limits.
b. Air
purifying respirators with APF <100 must be equipped with particulate
filters that are at least 95% efficient. Air purifying respirators with APF =
100 must be equipped with particulate filters that are at least 99% efficient.
Air purifying respirators with APF >100 must be equipped with particulate
filters that area t least 99.97% efficient.
c. The licensee may apply to the Agency for
the use of an APF greater than one for sorbent cartridges as protection against
airborne radioactive gases and vapors (e.g.,
radioiodine).
d. Licensees may
permit individuals to use this type of respirator who have not been medically
screened or fit tested on the device provided that no credit be taken for their
use in estimating intake or dose. It is also recognized that it is difficult to
perform an effective positive or negative pressure pre-use user seal check on
this type of device. All other respiratory protection program requirements
listed in
105 CMR
120.233 apply. An assigned protection factor
has not been assigned for these devices. However, an APF equal to ten may be
used if the licensee can demonstrate a fit factor of at least 100 by use of a
validated or evaluated, qualitative or quantitative fit test.
e. Under-chin type only. No distinction is
made in
105
CMR
120.296:
Appendix A
between elastomeric half-masks with replaceable cartridges and those designed
with the filter medium as an integral part of the facepiece
(
e.g., disposable or reusable disposable). Both types are
acceptable so long as the seal area of the latter contains some substantial
type of seal enhancing material such as rubber or plastic, the two or more
suspension straps are adjustable, the filter medium is at least 95% efficient
and all other requirements of
105 CMR
120.298:
Appendix A are
met.
f. The assigned protection
factors for gases and vapors are not applicable to radioactive contaminants
that present an absorption or submersion hazard. For tritium oxide vapor,
approximately a of the intake occurs by absorption through the skin so that an
overall protection factor of three is appropriate when atmosphere-supplying
respirators are used to protect against tritium oxide. Exposure to radioactive
noble gases is not considered a significant respiratory hazard, and protective
actions for these contaminants should be based on external (submersion) dose
considerations.
g. No NIOSH
approval schedule is currently available for atmospheric supplying units. This
equipment may be used in an acceptable respiratory protection program as long
as all the other minimum program requirements, with the exception of fit
testing, are met (
i.e.,
105 CMR
120.233) .
h. The licensee should implement
institutional controls to assure that these devices are not used in areas
immediately dangerous to life or health (IDLH).
i. This type of respirator may be used as an
emergency device in unknown concentrations for protection against inhalation
hazards. External radiation hazards and other limitations to permitted exposure
such as skin absorption shall be taken into account in these circumstances.
This device may not be used by any individual who experiences perceptible
outward leakage of breathing gas while wearing the device.
