Panasonic PT-DZ12000U

Airborne Activity General Dispersion Model
Assume a 1 uCi (37 kBq) release of respirable Pu inside a
239
large room measuring 12 x 12 x 3 meters with a ventilation
turnover rate of 7 volumes per hour.
The General Dispersion Model uses this 2ð formula for
volume. V = 2/3ð x R
3
Volume in cm 30 cm 1 M 10 M
3
@ distance R 5.65E4 2.09E6 2.09E9
Concentration @ distance R
in uCi / cc 1.77E-5 4.78E-7 4.78E-10
Time required for the airborne wave front to reach distance R
13 sec 43 sec 7.15 min
1 CFM sample for 1 week equals 10,080 CF (285.4 M )
3
2 CFM sample for 1 week equals 20,160 CF (571 M )
3
Calculating Airborne Radioactivity (long-lived)
SN
C = R / (V x î x SA x CE x CF)
S
C = activity concentration at end of sample run time
N
R = net counting rate
V = sample volume
î = detector efficiency
SA = self-absorption factor
CE = collection efficiency
CF = conversion from disintegrations per unit time to activity
Calculating Airborne Radioactivity (short-lived)
SN
C = R / [V x î x SA x CE x CF x (1-e ) x (e )]
-ëTs -ëTd
Ts = sample count time
Tb = time elapsed between end of sample collection time
and start of sample count time
Airborne Activity General Dispersion Model
Assume a 1 uCi (37 kBq) release of respirable Pu inside a
239
large room measuring 12 x 12 x 3 meters with a ventilation
turnover rate of 7 volumes per hour.
The General Dispersion Model uses this 2ð formula for
volume. V = 2/3ð x R
3
Volume in cm 30 cm 1 M 10 M
3
@ distance R 5.65E4 2.09E6 2.09E9
Concentration @ distance R
in uCi / cc 1.77E-5 4.78E-7 4.78E-10
Time required for the airborne wave front to reach distance R
13 sec 43 sec 7.15 min
1 CFM sample for 1 week equals 10,080 CF (285.4 M )
3
2 CFM sample for 1 week equals 20,160 CF (571 M )
3
Calculating Airborne Radioactivity (long-lived)
SN
C = R / (V x î x SA x CE x CF)
S
C = activity concentration at end of sample run time
N
R = net counting rate
V = sample volume
î = detector efficiency
SA = self-absorption factor
CE = collection efficiency
CF = conversion from disintegrations per unit time to activity
Calculating Airborne Radioactivity (short-lived)
SN
C = R / [V x î x SA x CE x CF x (1-e ) x (e )]
-ëTs -ëTd
Ts = sample count time
Tb = time elapsed between end of sample collection time
and start of sample count time
Airborne Activity General Dispersion Model
Assume a 1 uCi (37 kBq) release of respirable Pu inside a
239
large room measuring 12 x 12 x 3 meters with a ventilation
turnover rate of 7 volumes per hour.
The General Dispersion Model uses this 2ð formula for
volume. V = 2/3ð x R
3
Volume in cm 30 cm 1 M 10 M
3
@ distance R 5.65E4 2.09E6 2.09E9
Concentration @ distance R
in uCi / cc 1.77E-5 4.78E-7 4.78E-10
Time required for the airborne wave front to reach distance R
13 sec 43 sec 7.15 min
1 CFM sample for 1 week equals 10,080 CF (285.4 M )
3
2 CFM sample for 1 week equals 20,160 CF (571 M )
3
Calculating Airborne Radioactivity (long-lived)
SN
C = R / (V x î x SA x CE x CF)
S
C = activity concentration at end of sample run time
N
R = net counting rate
V = sample volume
î = detector efficiency
SA = self-absorption factor
CE = collection efficiency
CF = conversion from disintegrations per unit time to activity
Calculating Airborne Radioactivity (short-lived)
SN
C = R / [V x î x SA x CE x CF x (1-e ) x (e )]
-ëTs -ëTd
Ts = sample count time
Tb = time elapsed between end of sample collection time
and start of sample count time
Airborne Activity General Dispersion Model
Assume a 1 uCi (37 kBq) release of respirable Pu inside a
239
large room measuring 12 x 12 x 3 meters with a ventilation
turnover rate of 7 volumes per hour.
The General Dispersion Model uses this 2ð formula for
volume. V = 2/3ð x R
3
Volume in cm 30 cm 1 M 10 M
3
@ distance R 5.65E4 2.09E6 2.09E9
Concentration @ distance R
in uCi / cc 1.77E-5 4.78E-7 4.78E-10
Time required for the airborne wave front to reach distance R
13 sec 43 sec 7.15 min
1 CFM sample for 1 week equals 10,080 CF (285.4 M )
3
2 CFM sample for 1 week equals 20,160 CF (571 M )
3
Calculating Airborne Radioactivity (long-lived)
SN
C = R / (V x î x SA x CE x CF)
S
C = activity concentration at end of sample run time
N
R = net counting rate
V = sample volume
î = detector efficiency
SA = self-absorption factor
CE = collection efficiency
CF = conversion from disintegrations per unit time to activity
Calculating Airborne Radioactivity (short-lived)
SN
C = R / [V x î x SA x CE x CF x (1-e ) x (e )]
-ëTs -ëTd
Ts = sample count time
Tb = time elapsed between end of sample collection time
and start of sample count time