Panasonic PT-DZ12000U

Exposure Rate in an Air-Filled Ion Chamber
X = I / m[1 / (2.58E-4 C / kg)-R]
X = exposure rate (R / sec)
I = current (amperes)
m = mass of air in chamber (kg)
% Resolution of a Gamma Spec System
% R = FWHM / peak energy x 100 = % resolution
FWHM = peak energy width at full width half-max height
peak energy = photopeak energy of interest
True Count Rate Based on the
Resolving Time of a Gas-Filled Detector
C00
R = R / (1 - R Y) = true count rate
0
R = observed count rate
Y = resolving time
Specific Gamma-Ray Constant (Ã) for Source Activity (A)
ã en air
à = öE(ì / ñ) e / W
à = specific gamma constant (R-cm / hr-A)
2
ö = photon fluence rate (ã / cm -hr)
2
ã
E = gamma photon energy (MeV)
en
(ì / ñ) = density thickness of air (g / cm )
2
e = electron charge (Coulombs)
W = average amount of energy to produce an ion
pair in air (eV)
Dose Rate (D) to Air from a Point Beta Source
D = 300 A / d = rad /hr
2
A = source activity in curies
d = distance from source in feet
61
Exposure Rate in an Air-Filled Ion Chamber
X = I / m[1 / (2.58E-4 C / kg)-R]
X = exposure rate (R / sec)
I = current (amperes)
m = mass of air in chamber (kg)
% Resolution of a Gamma Spec System
% R = FWHM / peak energy x 100 = % resolution
FWHM = peak energy width at full width half-max height
peak energy = photopeak energy of interest
True Count Rate Based on the
Resolving Time of a Gas-Filled Detector
C00
R = R / (1 - R Y) = true count rate
0
R = observed count rate
Y = resolving time
Specific Gamma-Ray Constant (Ã) for Source Activity (A)
ã en air
à = öE(ì / ñ) e / W
à = specific gamma constant (R-cm / hr-A)
2
ö = photon fluence rate (ã / cm -hr)
2
ã
E = gamma photon energy (MeV)
en
(ì / ñ) = density thickness of air (g / cm )
2
e = electron charge (Coulombs)
W = average amount of energy to produce an ion
pair in air (eV)
Dose Rate (D) to Air from a Point Beta Source
D = 300 A / d = rad /hr
2
A = source activity in curies
d = distance from source in feet
61
Exposure Rate in an Air-Filled Ion Chamber
X = I / m[1 / (2.58E-4 C / kg)-R]
X = exposure rate (R / sec)
I = current (amperes)
m = mass of air in chamber (kg)
% Resolution of a Gamma Spec System
% R = FWHM / peak energy x 100 = % resolution
FWHM = peak energy width at full width half-max height
peak energy = photopeak energy of interest
True Count Rate Based on the
Resolving Time of a Gas-Filled Detector
C00
R = R / (1 - R Y) = true count rate
0
R = observed count rate
Y = resolving time
Specific Gamma-Ray Constant (Ã) for Source Activity (A)
ã en air
à = öE(ì / ñ) e / W
à = specific gamma constant (R-cm / hr-A)
2
ö = photon fluence rate (ã / cm -hr)
2
ã
E = gamma photon energy (MeV)
en
(ì / ñ) = density thickness of air (g / cm )
2
e = electron charge (Coulombs)
W = average amount of energy to produce an ion
pair in air (eV)
Dose Rate (D) to Air from a Point Beta Source
D = 300 A / d = rad /hr
2
A = source activity in curies
d = distance from source in feet
61
Exposure Rate in an Air-Filled Ion Chamber
X = I / m[1 / (2.58E-4 C / kg)-R]
X = exposure rate (R / sec)
I = current (amperes)
m = mass of air in chamber (kg)
% Resolution of a Gamma Spec System
% R = FWHM / peak energy x 100 = % resolution
FWHM = peak energy width at full width half-max height
peak energy = photopeak energy of interest
True Count Rate Based on the
Resolving Time of a Gas-Filled Detector
C00
R = R / (1 - R Y) = true count rate
0
R = observed count rate
Y = resolving time
Specific Gamma-Ray Constant (Ã) for Source Activity (A)
ã en air
à = öE(ì / ñ) e / W
à = specific gamma constant (R-cm / hr-A)
2
ö = photon fluence rate (ã / cm -hr)
2
ã
E = gamma photon energy (MeV)
en
(ì / ñ) = density thickness of air (g / cm )
2
e = electron charge (Coulombs)
W = average amount of energy to produce an ion
pair in air (eV)
Dose Rate (D) to Air from a Point Beta Source
D = 300 A / d = rad /hr
2
A = source activity in curies
d = distance from source in feet
61