Conversion factor

The following table shows how different people use different conversion factors for the same tube. Who is right ?

Geiger Tube Isotope CPM * conversion factor = μSv/h Used by
LND 712 60Co

137Cs

1/107 = 0.00926

1/120 = 0.00833

blackcatsystems
GM10
LND 712 60Co

137Cs

1/123 = 0.00812

1/111 = 0.009

Nuova Elettronica
Kit LX.1710
LND 712 1/100 = 0.01 cooking-hacks
Radiation Sensor Board for Arduino
LND 712 1/429 = 0.00233 libelium
Wireless Sensor Networks to Control Radiation Levels
LND 712 1/429 = 0.00233 (up to June 9, 2011)

1/120 = 0.00833 (since June 9, 2011)

pachube
Geiger Counter Feeds from Asao Kawasaki
LND 712 1/429 = 0.00233 geigermaps
Create a new radiation feed to an open database
LND 712 137Cs 1/123 = 0.00812 Kansan
簡易なカウント数からシーベルトへの換算
J305ß 1/360 = 0.0027 Youtube
First tests with Arduino based Geiger sensor
J305ß 1/123 = 0.00812 cooking-hacks
Radiation Sensor Board for Arduino
J305ß 60Co 1/123 = 0.00812 Libelium (private email correspondence)
SBM-20 60Co

226Ra

1/150 = 0.00664

1/198 = 0.00504

Nuova Elettronica
Kit LX.1710
SBM-20 60Co

226Ra

1/150 = 0.00664

1/198 = 0.00504

Kansan
簡易なカウント数からシーベルトへの換算
SBM-20 60Co

137Cs

1/150 = 0.00664

1/171 = 0.00584

Libelium (private email correspondence)
SBM-20 1/175 = 0.0057 cooking-hacks
Radiation Sensor Board for Arduino
SBM-20 1/360 = 0.00277 libelium
Wireless Sensor Networks to Control Radiation Levels
SBM-20 1/360 = 0.00277 youtube
Enotria1 con Libelium primo start
Unknown 1/360 = 0.00277 Safecast
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