AIR MONITORING
Concentration
Concentration is activity per volume of air and may be stated
as dpm / cubic meter, ìCi / ml, or Bq / cubic meter. DAC
(Derived Air Concentration) is another way to express
airborne radioactivity concentrations as relative hazards.
DPM = Sample CPM / Eff (CPM / DPM)
1 uCi = 2.22 E6 DPM
1 DPM / M = 4.5 E-13 uCi / ml
3
1 uCi / ml = 2.22 E12 DPM / M
3
1 Bq = 1 DPS
DPM / M = CPM/(Eff x total sample volume in M )
33
uCi / ml = CPM/(Eff x 2.22 E6 DPM / uCi x total
sample volume in ml)
Bq / M = CPM / (Eff x 60 DPM / Bq x total sample
3
volume in M )
3
DAC = uCi / ml ( uCi / ml per DAC {DAC Factor} )
1 DAC-h = 1 DAC exposure for 1 hour
1 DAC-h = 2.5 mrem = 25 uSv
1 DAC for Pu239 is 11.1 DPM / M
3
Calculate the number of DAC-h on a filter by this formula
# DAC-h = # of DPM on filter
(Sample flow rate in LPM x 1.332E11 x DAC factor)
Calculate the DPM on a filter to reach 8 DAC-h
DPM = 8 DAC-h x flow rate in LPM x 1.33E11 x DAC factor
Calculate the DAC level on a filter from the # of DPM
DAC= # of DPM
(DAC factor x LPM x time in minutes x 2.22E9)
AIR MONITORING
Concentration
Concentration is activity per volume of air and may be stated
as dpm / cubic meter, ìCi / ml, or Bq / cubic meter. DAC
(Derived Air Concentration) is another way to express
airborne radioactivity concentrations as relative hazards.
DPM = Sample CPM / Eff (CPM / DPM)
1 uCi = 2.22 E6 DPM
1 DPM / M = 4.5 E-13 uCi / ml
3
1 uCi / ml = 2.22 E12 DPM / M
3
1 Bq = 1 DPS
DPM / M = CPM/(Eff x total sample volume in M )
33
uCi / ml = CPM/(Eff x 2.22 E6 DPM / uCi x total
sample volume in ml)
Bq / M = CPM / (Eff x 60 DPM / Bq x total sample
3
volume in M )
3
DAC = uCi / ml ( uCi / ml per DAC {DAC Factor} )
1 DAC-h = 1 DAC exposure for 1 hour
1 DAC-h = 2.5 mrem = 25 uSv
1 DAC for Pu239 is 11.1 DPM / M
3
Calculate the number of DAC-h on a filter by this formula
# DAC-h = # of DPM on filter
(Sample flow rate in LPM x 1.332E11 x DAC factor)
Calculate the DPM on a filter to reach 8 DAC-h
DPM = 8 DAC-h x flow rate in LPM x 1.33E11 x DAC factor
Calculate the DAC level on a filter from the # of DPM
DAC= # of DPM
(DAC factor x LPM x time in minutes x 2.22E9)
AIR MONITORING
Concentration
Concentration is activity per volume of air and may be stated
as dpm / cubic meter, ìCi / ml, or Bq / cubic meter. DAC
(Derived Air Concentration) is another way to express
airborne radioactivity concentrations as relative hazards.
DPM = Sample CPM / Eff (CPM / DPM)
1 uCi = 2.22 E6 DPM
1 DPM / M = 4.5 E-13 uCi / ml
3
1 uCi / ml = 2.22 E12 DPM / M
3
1 Bq = 1 DPS
DPM / M = CPM/(Eff x total sample volume in M )
33
uCi / ml = CPM/(Eff x 2.22 E6 DPM / uCi x total
sample volume in ml)
Bq / M = CPM / (Eff x 60 DPM / Bq x total sample
3
volume in M )
3
DAC = uCi / ml ( uCi / ml per DAC {DAC Factor} )
1 DAC-h = 1 DAC exposure for 1 hour
1 DAC-h = 2.5 mrem = 25 uSv
1 DAC for Pu239 is 11.1 DPM / M
3
Calculate the number of DAC-h on a filter by this formula
# DAC-h = # of DPM on filter
(Sample flow rate in LPM x 1.332E11 x DAC factor)
Calculate the DPM on a filter to reach 8 DAC-h
DPM = 8 DAC-h x flow rate in LPM x 1.33E11 x DAC factor
Calculate the DAC level on a filter from the # of DPM
DAC= # of DPM
(DAC factor x LPM x time in minutes x 2.22E9)
AIR MONITORING
Concentration
Concentration is activity per volume of air and may be stated
as dpm / cubic meter, ìCi / ml, or Bq / cubic meter. DAC
(Derived Air Concentration) is another way to express
airborne radioactivity concentrations as relative hazards.
DPM = Sample CPM / Eff (CPM / DPM)
1 uCi = 2.22 E6 DPM
1 DPM / M = 4.5 E-13 uCi / ml
3
1 uCi / ml = 2.22 E12 DPM / M
3
1 Bq = 1 DPS
DPM / M = CPM/(Eff x total sample volume in M )
33
uCi / ml = CPM/(Eff x 2.22 E6 DPM / uCi x total
sample volume in ml)
Bq / M = CPM / (Eff x 60 DPM / Bq x total sample
3
volume in M )
3
DAC = uCi / ml ( uCi / ml per DAC {DAC Factor} )
1 DAC-h = 1 DAC exposure for 1 hour
1 DAC-h = 2.5 mrem = 25 uSv
1 DAC for Pu239 is 11.1 DPM / M
3
Calculate the number of DAC-h on a filter by this formula
# DAC-h = # of DPM on filter
(Sample flow rate in LPM x 1.332E11 x DAC factor)
Calculate the DPM on a filter to reach 8 DAC-h
DPM = 8 DAC-h x flow rate in LPM x 1.33E11 x DAC factor
Calculate the DAC level on a filter from the # of DPM
DAC= # of DPM
(DAC factor x LPM x time in minutes x 2.22E9)
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