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LS 6000 Scintillation System User’s Manual
PN 247971-F
4-14
Setting Up User Programs
Editing A User Program
Phase Monitor
The 2 Phase Monitor detects and flags samples that have separated into two phases. A two
phase sample may yield inaccurate counting data. The sample may be thoroughly emulsified
when placed in the instrument, and may separate while waiting to be counted. Sometimes the
two phases are visually distinct. In other cases the only difference seen is a slight haze. When
plastic vials are used, even a distinct separation is not visible. If the sample and LS cocktail
separate into two distinct phases, the counting results may be invalid. When 2 Phase is
selected On, a warning is printed as 2P on the printout under the column heading 2Phase, if
phase separation has occurred. The sample is still counted.
To change the setting, highlight “Quench/Lum-Ex/2Phase” and press SELECT. The menu
shown in Figure 4.8 is displayed. Highlight “2 Phase Monitor” (if installed) and choose NO
(Off) or YES (On). If no other changes are desired, press PREVIOUS MENU to display the
Review/Edit Menu shown in Figure 4.4.
NOTE H# must be selected when 2 Phase Monitor is On. The minimu.m sample volume is 2.5 mL.
Low Level
Low Level provides a method of reducing the background counts caused by cosmic ray
interaction with glass in the counting chamber. Typically, the background of the unquenched
back-ground standard supplied with the instrument is reduced 50% when Low Level is used.
To change the setting, highlight “Low Level/Low Count Reject” and press SELECT. The Main
Editing Window displays two prompts. Highlight “Low Level Count Option” (if installed)
and choose Off or On. Press PREVIOUS MENU to display the Review/Edit Menu shown in
Figure 4.4.
NOTE Low Level is not available when Xtal is selected as the scintillator, or when Auto DPM Data Calculation
program is selected.
Low Count Reject
Low Sample Reject is provided to avoid excessive time counting samples with little or no
radioactivity, if these samples are not of interest. When Low Sample Reject is On, the sample
is monitored during the first 6 seconds of count time and then monitored every 3 seconds. If
the level of radioactivity in the sample is below the value entered for Low Count Reject
during any 3 second update, the sample count is terminated, the data printed, and the next
sample counted. The sample is rejected only if the cpm value is below the established value
for all isotopes selected.
To change the setting, highlight “Low Level/Low Count Reject” and press SELECT. The Main
Editing Window displays two prompts. Highlight “Low Count Reject Threshold”, and enter
the cpm of the threshold for low count reject. A zero turns Low Count Reject off. Press
PREVIOUS MENU to display the Re-view/Edit Menu shown in Figure 4.4.
Output Formats
The Output Format is dependent upon the Data Calculation Program selected. Standard print
formats for each of the Data Calculation Programs are given in the respective sections in
Section 5. The format of the printout can be customized to your requirements. The Edit
Formats are described in this section. If the RS232 port and/or the disk are installed, the
output formats for these can also be edited, as described in this section.
- LS 6000 Series 1
- Table of Contents 3
- Introduction 11
- Principles of Operation 12
- Operating the Instrument 12
- Operating Modes 13
- 1.3 Specifications 14
- Precautions and Limitations 15
- Figure 1.1 Standard Vial 15
- Miniature Vials 16
- 1.5 Hazards 17
- Maintenance 18
- Getting Started 19
- 2.2 Power Failure 21
- 2.3 Operating Controls 21
- Operator Control Key pad 22
- Using the Operating Controls 24
- 2.4 Using the Racks 25
- Using the Racks 26
- Setting Up the Racks 27
- 2.5 Preparing the Printer 29
- 2.6 System Setup 30
- Energy Scale 31
- Printer Paging 32
- Allow Interrupt Count 32
- System Setup 33
- Figure 2.9 RS232 Setup Menu 33
- Date/Time 35
- Auto DPM 35
- 2.7 Calibration 36
- Counting Samples 39
- Starting the Automatic Count 40
- Conducting Count Single Rack 41
- 3.4 Auto DPM 46
- 3.5 Multi-Task 47
- Interrupt Count in Multi-Task 48
- Multi-Task 50
- Interrupt Data 51
- Setting Up User Programs 59
- 4.2 Editing A User Program 61
- Editing A User Program 62
- Comments 65
- Counting Time 65
- Liquid or Xtal Scintillator 65
- Isotope 1 65
- Isotope 2 and Isotope 3 66
- Edit Other Parameters 67
- Counting Precision 69
- Background/Blank Subtraction 69
- Lum-Ex Correction 71
- Phase Monitor 72
- Low Level 72
- Low Count Reject 72
- Output Formats 72
- Count Data 75
- Raw Data 75
- Collecting Spectral Data 76
- 4.3 Copy User Program 77
- Copy User Program 78
- 5.2 CPM/Xtal CPM 80
- CPM/Xtal CPM 81
- Results for CPM/Xtal CPM 83
- 5.4 Auto DPM 85
- Setting Up Auto DPM 86
- Loading Samples for Auto DPM 86
- Results for Auto DPM 86
- Setting Up DPM 87
- 5.6 Xtal DPM 89
- Xtal DPM 90
- Setting Up Xtal DPM 91
- Loading Samples for Xtal DPM 92
- 5.7 DPM % of Reference 93
- Setting Up DPM % of Reference 94
- Xtal SL DPM % of Reference 95
- 5.9 Single Photon Monitoring 98
- Data Calculation 100
- Single Photon Monitoring 100
- Isotope/DPM Libraries 103
- Accessing the Isotope Library 104
- Printing the Isotope Library 104
- The Isotope Library 105
- Setup Menu 106
- PN 247971-F 108
- 5 minutes 109
- 6.2 Setting Up A Quench Curve 110
- Setting Up A Quench Curve 112
- Counting the Standards 114
- Editing Quench Curves 120
- Deleting A Quench Curve 124
- Manual Entry of Quench Curves 125
- 7.1 Chemiluminescence 127
- Interpretation of Results 128
- Reducing Single Photon Events 128
- 7.3 Two Phase Samples 129
- Procedures 131
- Analysis of Data 131
- H Counting Efficiency 132
- C Counting Efficiency 132
- Background 133
- Contamination 133
- Instrument Specifications 135
- Temperature Control Accessory 138
- Installation Requirements 139
- Electrical Requirements 140
- 0.5 to 1.0 m in 140
- Environment Requirements 142
- . Note that the output 144
- Datum IDs 146
- CHAPTER 1, PART 31 167
- Region I 170
- Region II 170
- Region III 170
- Region IV 170
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