Ionization chamber type

p_dis

p_wall

p_cel

s_w,air p_Qo

Cylindrical chamber

PTW 23323 micro

0.993

1.001

0.993

1.119

PTW 30001/30010 Farmer

0.988

1.001

0.993

1.113

PTW 31002 flexible

0.989

1.001

0.993

1.114

PTW 31014 Pin Point

0.996

0.998

0.993

1.118

Plane-parallel chamber

PTW 34045 Markus

-

1.009

-

1.144

PTW 34001 Roos

-

1.010

-

1.145