
LS 6000 Scintillation System User’s Manual
PN 247971-F
4-7
Setting Up User Programs
Editing A User Program
4
Comments
The Comments line provides descriptive data that is printed in the program summary. A
comment line is not required.
To enter or revise a comment, highlight “Comments”. Enter your comments using up to 28
characters.
Counting Time
The counting time is the length of time each sample is counted. To change counting time,
highlight “Counting Time”. Enter the desired counting time in minutes.
NOTE Counting a sample may be terminated before reaching this selected counting time if the selected
counting precision is achieved earlier. See Counting Precision Section 4 for more information on counting
precision.
Liquid or Xtal Scintillator
Beckman instruments has developed Xtalsclnt
tm
(pronounced crystalsclnt) products (Ready
Cap™
and Ready Filter™ for counting samples using solid scintillators. When using a solid
scintillator, setting the instrument to Xtal optimizes the counting conditions. The Data
Calculation programs are set for use with solid scintillators and the Isotope Library is set to
Xtal. When liquid is chosen as the scintillator, the system is optimized for liquid scintillators,
and the Data Calculation programs and Isotope Library are set for liquid scintillator counting.
NOTE Xtal is not selected as the scintillator for counting samples on solid supports such as filters, if liquid
scintillator cocktail is used to emulsify the sample.
To change the type of scintillator, highlight “Scintillator” and choose the desired value, Liquid
or Xtal.
Isotope 1
Isotope 1 sets the counting window for the samples counted based on the settings stored in
the Isotope Library for the Isotope selected. The isotopes displayed are either from the Liquid
Isotope Library or the Xtal Isotope Library, depending on the choice for scintillator described
in Liquid or Xtal Scintillator Section 4. Refer to Section 6.1 for more information on the
Isotope Library.
To change the selected Isotope, highlight “Isotope 1”. The Isotopes stored in the Isotope
Library are displayed in the Data
Entry Window:
3
H;
125
I;
14
C;
35
S;
32
P; Manual; Wide; and SPM (if installed). Any Isotopes
added to the Isotope Library are displayed also. Choose the desired Isotope from the list.
NOTE If the isotope you wish to count is not listed, return to the Main Menu and set up the isotope using
New Isotope Setup. Refer to Section for adding an isotope to the library.
Choose Wide when you want to count the entire energy spectrum. Choose Manual to enter in
the desired window settings. A prompt appears under Isotope selection when Manual is
selected. Highlight the prompt and enter the desired window settings in the format shown:
0— 1000 channels (or 2000 Key). The scale used is determined by the parameter set for
Energy Scale in System Setup. Refer to Section for more information on Energy Scale.
Comentarios a estos manuales