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The neutron activation analysis is generally performed in three steps: (1) irradiation, (2) dissolving and chemical separation (often), and (3) counting.
English (United States)
This text was extracted from a PDF file.
This is the abbreviated version, containing approximately
80% of the total text.
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Automatic Control Of Analytical Results Obtained By Neutron Activation
The neutron activation analysis is generally performed in three steps: (1)
irradiation, (2) dissolving and chemical separation (often), and (3) counting.
When a chemical separation is necessary, the yield of this separation is not
known and important errors result therefrom. Therefore, there is an actual need
for a method for precisely determining the yield of separation.
The basic problem is to determine an element (see original) C (Z is the
atomic number and A the atomic weight in another element (see original), B, both
of them becoming radioactive during neutron irradiation. The neutronic
irradiation gives: (see original) It is impossible to count this sample because there
are too many gamma radiations emitted by (see original); therefore, (see original)
is separated from (see original).
Before making the chemical separation, another radioactive
element is prepared having the following characteristics:
The same Z
A is different; for instance, A-1 (see original)
This element is radioactive and is an emitter Gamma
(X" KeV, with (see original) and its activity
Now the sample is dissolved by an acid or basic solution and
the (see original) (with a known activity) element is added, then
separated chemically. The activity of the element (see original) may
always be measured, and the knowledge of this activity gives the
yield for (see original) (analyzed element).
It is thus impossible t...