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3. RADIATION MONITORING
Once the Detective-EX displays the
Ready
status, the calibration has been checked, and the
background has been measured, the instrument is ready for use. This chapter tells you how to
use the Survey, Identification, Search, Monitor, and SNM Modes.
Some users will find enough information in this chapter to begin using the
Detective-EX right away — operation is very straightforward.
However, we also recommend the following reading:
!
Chapter 4 lists the messages the Detective-EX displays when it identifies radionuclides.
!
Chapter 5 discusses the functions on the Advanced menu. These administrator-level
commands allow you to set up and adjust a number of detector functions, such as turning
on the mechanical cooler, selecting the location where spectrum files will be stored,
choosing the dose-rate units to be displayed, determining the frequency of auto-calibra-
tion, configuring the SNM search dwell time and quality factor, customizing the dose
alarm sensitivity, and adjusting the “scroll rate” for the Search Mode strip-chart
emulation.
IMPORTANT
You can set a password to limit access to the second and third pages of
the Advanced menu; see Section 5.2.4.1 for instructions.
!
Chapter 6 provides instructions on downloading spectrum files to a computer.
!
Chapter 8 gives detailed information on connecting the Detective-EX to a computer and
using it as a high-performance benchtop multichannel buffer with MAESTRO or other
ORTEC spectroscopy applications.
3.1. Survey (Count-Rate/Dose-Rate) Mode
In Survey Mode (Fig. 23), the Detective-EX behaves as a passive monitor, showing the current
gamma count and dose rate; neutron count rate (for units so equipped); instrument status;
detector dead time, available disk storage space and battery charge; time and date; and GPS
coordinates.
The three rate indicators show the count rate or dose as both a value and a bar graph. The
color of the bar changes with increasing rate. The lowest rate is green, then yellow, then red.
The
γ
(gamma) Count Rate bar changes to yellow at~6300 counts per second (cps), and red
at ~13300 cps. At ~20,000 cps, the red bar begins flashing. These various states are illustrated in
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