PCM-2 Manual.pdf - Voss Associates

Section 5
Edit
I View
PCM-2 VERSION Vl.9
~I
Edit Status Cal ibration Utilit~
II
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Detector Parameters
Hand Probe Parameters
Override Parameters
System Parameters
Instrument Setup Parameters
sum Zone Setup
IBan~eSSages
Preset All Mode
System Parameters
In Preset All count mode, the alpha and beta RDAs, confidence factor, sigma
factors and count time are specified when the PCM-2 is set up. If background
count rates are (or become) too high, it is not possible to detect sources of the
specified activities (the RDAs) in the time allowed using the chosen confidence
and sigma factors; when this happens, the instrument displays a high background
failure message and ceases to perform measurements.
~system Parameters ­
Preset AlL Mod~ l
ALPHA RDA (DPS): 83.3
I BETA RDA (DPS): 417
ALPHA SENSITIVITY: 0.10
BETA SENSITIVITY: 0.50
RDA CONFIDENCE: 95%
COUNT TIME (SEC): 1.00
SIGMA FACTOR: 4.00
BACKGROUND SIGMA FACTOR: 4.00
ALPHA SUM ZONE ALARM (DPS): 23.3
BETA SUM ZONE ALARM (DPS): 117
'I
I
ALPHA SUM CH ALARM (DPS):
BETA SUM CH ALARM (DPS):
I~calculated
83.3
500
Values~~~~~=~=~==il
ALPHA RDA LOWER LIMIT (DPS): 2.56 I
BETA RDA LOWER LIMIT (DPS): 17.9
FALSE ALARM RATE (%): 0.19
~~M~IN~C~O~UN~~T~~T~I~M_E~~(~S~E~C)~:~~~~~~0~.~6~2~.~
PCM2.MANI REV AI April 1995
5-1