Gilson and Voss - Voss Associates

Airborne Radioactivity (long-lived)
C
S
= R
N
/ (V x å x SA x CE x CF)
C
S
= activity concentration at end of sample run time
R
N
= net counting rate
V = sample volume
å = detector efficiency
SA = self-absorption factor
CE = collection efficiency
CF = conversion from disintegrations per unit time to
activity
Airborne Radioactivity (short-lived)
-ëts -ëtd
C
S
= R
N
/ [V x å x SA x CE x CF x (1-e ) x (e )]
t
s
= sample count time
t
d
= time elapsed between end of sample run time and
start of sample count time
RESPIRATORY PROTECTION FACTORS (PF) 10CFR20
Device Mode Particulates Vapors PF
Air-purifying half-mask D Y N 10
Air-purifying full-face D Y N 50
Air-purifying full-face PP Y N 1000
Supplied-air hood PP Y Y 1000*
Supplied-air full-face PP Y Y 2000
SCBA D Y N 50
SCBA PD Y Y 10,000
* 2000 for supplied-air hood if run at max flow with calibrated
flow gauge.
Bubble suits have been used in Pu atmospheres as high as
1,000,000 DAC. Supplied-air respirators are worn inside the
bubble suits and real-time air monitoring INSIDE the bubble
suits is performed.
Page 68
Airborne Radioactivity (long-lived)
C
S
= R
N
/ (V x å x SA x CE x CF)
C
S
= activity concentration at end of sample run time
R
N
= net counting rate
V = sample volume
å = detector efficiency
SA = self-absorption factor
CE = collection efficiency
CF = conversion from disintegrations per unit time to
activity
Airborne Radioactivity (short-lived)
-ëts -ëtd
C
S
= R
N
/ [V x å x SA x CE x CF x (1-e ) x (e )]
t
s
= sample count time
t
d
= time elapsed between end of sample run time and
start of sample count time
RESPIRATORY PROTECTION FACTORS (PF) 10CFR20
Device Mode Particulates Vapors PF
Air-purifying half-mask D Y N 10
Air-purifying full-face D Y N 50
Air-purifying full-face PP Y N 1000
Supplied-air hood PP Y Y 1000*
Supplied-air full-face PP Y Y 2000
SCBA D Y N 50
SCBA PD Y Y 10,000
* 2000 for supplied-air hood if run at max flow with calibrated
flow gauge.
Bubble suits have been used in Pu atmospheres as high as
1,000,000 DAC. Supplied-air respirators are worn inside the
bubble suits and real-time air monitoring INSIDE the bubble
suits is performed.
Page 68
Airborne Radioactivity (long-lived)
C
S
= R
N
/ (V x å x SA x CE x CF)
C
S
= activity concentration at end of sample run time
R
N
= net counting rate
V = sample volume
å = detector efficiency
SA = self-absorption factor
CE = collection efficiency
CF = conversion from disintegrations per unit time to
activity
Airborne Radioactivity (short-lived)
-ëts -ëtd
C
S
= R
N
/ [V x å x SA x CE x CF x (1-e ) x (e )]
t
s
= sample count time
t
d
= time elapsed between end of sample run time and
start of sample count time
RESPIRATORY PROTECTION FACTORS (PF) 10CFR20
Device Mode Particulates Vapors PF
Air-purifying half-mask D Y N 10
Air-purifying full-face D Y N 50
Air-purifying full-face PP Y N 1000
Supplied-air hood PP Y Y 1000*
Supplied-air full-face PP Y Y 2000
SCBA D Y N 50
SCBA PD Y Y 10,000
* 2000 for supplied-air hood if run at max flow with calibrated
flow gauge.
Bubble suits have been used in Pu atmospheres as high as
1,000,000 DAC. Supplied-air respirators are worn inside the
bubble suits and real-time air monitoring INSIDE the bubble
suits is performed.
Page 68
Airborne Radioactivity (long-lived)
C
S
= R
N
/ (V x å x SA x CE x CF)
C
S
= activity concentration at end of sample run time
R
N
= net counting rate
V = sample volume
å = detector efficiency
SA = self-absorption factor
CE = collection efficiency
CF = conversion from disintegrations per unit time to
activity
Airborne Radioactivity (short-lived)
-ëts -ëtd
C
S
= R
N
/ [V x å x SA x CE x CF x (1-e ) x (e )]
t
s
= sample count time
t
d
= time elapsed between end of sample run time and
start of sample count time
RESPIRATORY PROTECTION FACTORS (PF) 10CFR20
Device Mode Particulates Vapors PF
Air-purifying half-mask D Y N 10
Air-purifying full-face D Y N 50
Air-purifying full-face PP Y N 1000
Supplied-air hood PP Y Y 1000*
Supplied-air full-face PP Y Y 2000
SCBA D Y N 50
SCBA PD Y Y 10,000
* 2000 for supplied-air hood if run at max flow with calibrated
flow gauge.
Bubble suits have been used in Pu atmospheres as high as
1,000,000 DAC. Supplied-air respirators are worn inside the
bubble suits and real-time air monitoring INSIDE the bubble
suits is performed.
Page 68