GE Typhoon 9200, Руководство по эксплуатации

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Typhoon Operating Instructions 28-9623-56 AA
33
Operation 4
Preparations before start 4.3
Prepare Storage phosphor
screen for exposure
Note: This section is valid only when performing Storage phosphor screen
autoradiography.
Recommendations for erasing screens
• To avoid contaminating the screen or the Image eraser, make sure that both the
screen and Image eraser are free from radioactive contamination before placing
the screen on the Image eraser (see
Sections 5.4 and 5.6).
• Erase the screen immediately before exposure as well as after scanning. Cosmic
radiation creates background on screens left unused for long periods of time.
• Erase the screen until the recorded signal is fully removed.
• Because a TR screen is not possible to decontaminate, protect the Image eraser
and the screen from possible contamination by placing plastic wrap or polyester
film between the TR screen and the Image eraser surface.
Preparation procedure
1 Clean the screen before exposure, see Section 5.4 for cleaning instructions.
2 Erase the screen.
The Image eraser is used to erase any residual signal from screens.
a) Hold the screen by its edges with the white side facing the Image eraser.
NOTICE
The Storage phosphor screen consists of a relatively soft matrix. Handle
the screen on the edges or back only. Do not touch the white phosphor
surface.
NOTICE
Wear powder-free gloves to avoid contaminating the screen with skin
oils or powder.
NOTICE
Do not fold or roll an unmounted screen.