ET Enterprises - Electron Tubes

pulse encoding

Here information is contained in the number of photons in each pulse, the rate of pulses and their individual pulse heights.

The pulses usually range in width from 1ns to 1µs. For example the pulses from a Na(TI) detector measuring gamma emissions from a 137Cs are characterised by a decay time of 230ns.

An typical requirements is:

 

Pulse height resolution with Na(TI) is 137Cs

≤7%
 

Background gamma rays (≥0.1MeV)

12dpm
 

Pulse height non-linearity at 25mA

≤5%
 

Dynamic range

1000-1