Gilson and Voss - Voss Associates
Gilson and Voss - Voss Associates
Gilson and Voss - Voss Associates
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Exposure Rate in an Air-Filled Ion Chamber<br />
X = I / m[1 / (2.58E-4 C / kg)-R]<br />
X = exposure rate (R / sec)<br />
I = current (amperes)<br />
m = mass of air in chamber (kg)<br />
% Resolution of a Gamma Spec System<br />
% R = FWHM / peak energy x 100 = % resolution<br />
FWHM = peak energy width at full width half-max height<br />
peak energy = photopeak energy of interest<br />
True Count Rate Based on the<br />
Resolving Time of a Gas-Filled Detector<br />
R<br />
C<br />
= R<br />
0<br />
/ (1 - R0Y) = true count rate<br />
R<br />
0<br />
= observed count rate<br />
Y = resolving time<br />
Specific Gamma-Ray Constant (Ã) for Source Activity (A)<br />
à = öE<br />
ã(ì en<br />
/ ñ)<br />
aire / W<br />
2<br />
à = specific gamma constant (R-cm / hr-A)<br />
ö =<br />
2<br />
photon fluence rate (ã / cm -hr)<br />
E<br />
ã<br />
= gamma photon energy (MeV)<br />
(ì<br />
en<br />
/ ñ) = density thickness of air (g / cm )<br />
e = electron charge (Coulombs)<br />
W = average amount of energy to produce an ion<br />
pair in air (eV)<br />
Dose Rate (D) to Air from a Point Beta Source<br />
D =<br />
2<br />
300 A / d = rad /hr<br />
A = source activity in curies<br />
d = distance from source in feet<br />
Exposure Rate in an Air-Filled Ion Chamber<br />
X = I / m[1 / (2.58E-4 C / kg)-R]<br />
X = exposure rate (R / sec)<br />
I = current (amperes)<br />
m = mass of air in chamber (kg)<br />
% Resolution of a Gamma Spec System<br />
% R = FWHM / peak energy x 100 = % resolution<br />
FWHM = peak energy width at full width half-max height<br />
peak energy = photopeak energy of interest<br />
True Count Rate Based on the<br />
Resolving Time of a Gas-Filled Detector<br />
R<br />
C<br />
= R<br />
0<br />
/ (1 - R0Y) = true count rate<br />
R<br />
0<br />
= observed count rate<br />
Y = resolving time<br />
Specific Gamma-Ray Constant (Ã) for Source Activity (A)<br />
à = öE<br />
ã(ì en<br />
/ ñ)<br />
aire / W<br />
2<br />
à = specific gamma constant (R-cm / hr-A)<br />
ö =<br />
2<br />
photon fluence rate (ã / cm -hr)<br />
E<br />
ã<br />
= gamma photon energy (MeV)<br />
2<br />
(ì<br />
en<br />
/ ñ) = density thickness of air (g / cm )<br />
e = electron charge (Coulombs)<br />
W = average amount of energy to produce an ion<br />
pair in air (eV)<br />
Dose Rate (D) to Air from a Point Beta Source<br />
D =<br />
2<br />
300 A / d = rad /hr<br />
A = source activity in curies<br />
d = distance from source in feet<br />
Page 61<br />
Page 61<br />
Exposure Rate in an Air-Filled Ion Chamber<br />
X = I / m[1 / (2.58E-4 C / kg)-R]<br />
X = exposure rate (R / sec)<br />
I = current (amperes)<br />
m = mass of air in chamber (kg)<br />
% Resolution of a Gamma Spec System<br />
% R = FWHM / peak energy x 100 = % resolution<br />
FWHM = peak energy width at full width half-max height<br />
peak energy = photopeak energy of interest<br />
True Count Rate Based on the<br />
Resolving Time of a Gas-Filled Detector<br />
R<br />
C<br />
= R<br />
0<br />
/ (1 - R0Y) = true count rate<br />
R<br />
0<br />
= observed count rate<br />
Y = resolving time<br />
Specific Gamma-Ray Constant (Ã) for Source Activity (A)<br />
à = öE<br />
ã(ì en<br />
/ ñ)<br />
aire / W<br />
2<br />
à = specific gamma constant (R-cm / hr-A)<br />
ö =<br />
2<br />
photon fluence rate (ã / cm -hr)<br />
E<br />
ã<br />
= gamma photon energy (MeV)<br />
(ì<br />
en<br />
/ ñ) = density thickness of air (g / cm )<br />
e = electron charge (Coulombs)<br />
W = average amount of energy to produce an ion<br />
pair in air (eV)<br />
Dose Rate (D) to Air from a Point Beta Source<br />
D =<br />
2<br />
300 A / d = rad /hr<br />
A = source activity in curies<br />
d = distance from source in feet<br />
Exposure Rate in an Air-Filled Ion Chamber<br />
X = I / m[1 / (2.58E-4 C / kg)-R]<br />
X = exposure rate (R / sec)<br />
I = current (amperes)<br />
m = mass of air in chamber (kg)<br />
% Resolution of a Gamma Spec System<br />
% R = FWHM / peak energy x 100 = % resolution<br />
FWHM = peak energy width at full width half-max height<br />
peak energy = photopeak energy of interest<br />
True Count Rate Based on the<br />
Resolving Time of a Gas-Filled Detector<br />
R<br />
C<br />
= R<br />
0<br />
/ (1 - R0Y) = true count rate<br />
R<br />
0<br />
= observed count rate<br />
Y = resolving time<br />
Specific Gamma-Ray Constant (Ã) for Source Activity (A)<br />
à = öE<br />
ã(ì en<br />
/ ñ)<br />
aire / W<br />
2<br />
à = specific gamma constant (R-cm / hr-A)<br />
ö =<br />
2<br />
photon fluence rate (ã / cm -hr)<br />
E<br />
ã<br />
= gamma photon energy (MeV)<br />
2<br />
(ì<br />
en<br />
/ ñ) = density thickness of air (g / cm )<br />
e = electron charge (Coulombs)<br />
W = average amount of energy to produce an ion<br />
pair in air (eV)<br />
Dose Rate (D) to Air from a Point Beta Source<br />
D =<br />
2<br />
300 A / d = rad /hr<br />
A = source activity in curies<br />
d = distance from source in feet<br />
Page 61<br />
Page 61
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