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ECD - SRI Instruments
Our ECD consists of a stainless steel cylinder containing radioactive Nickel-63. The Nickel-63 emits beta particles
(electrons) which collide with the carrier gas molecules, ionizing them in the process. This forms a stable cloud of
free electrons in the ECD cell. When electro-negative compounds enter the cell, they immediately combine with some of
the electrons, temporarily reducing the number remaining in the electron cloud. The detector electronics, which maintain
a constant current (about 1 nanoampere) through the electron cloud, are forced to pulse at a faster rate to compensate
for the decreased number of free electrons. The pulse rate is converted to an analog output, which is connected to the
data system.
Because it contains only 5 millicuries of Nickel-63, the ECD is covered by a "general license," which requires a periodic
wipe test and the filing of a form with your state's Department of Health or Radiation Safety. In most states, no annual fee
is required.
8690-0020
ECD detector
$ 6,179.00
ECD - Electron Capture Detector
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