FujiFilm ClearView CS, Service Manual

Page: 908 / 1404

CR-IR 363
Service Manual
MC-419
MC-419
011-202-11E
06.29.2012 FM6046
18. Shading/Sensitivity Correction for
IP Type HR and HR-BD
CAUTION
Make sure that the IP type HR-BD is correctly inserted into the HR-BD cassette
before making correction using the IP type HR-BD. To check, open the cassette
via a knob on the rear lid of the cassette, and confirm that a green marker
indicating the IP type HR-BD is at the right corner of the IP.
Even though an IP of a wrong type is inserted, the machine cannot recognize
the error.
Supplemental explanation
After the light-collecting guide is replaced, correction of optimizing optical
characteristics of the light-collecting guide and sensitivity characteristics of the
photomultiplier for each machine is required.
Necessary correction procedures to be taken are determined according to which type
of the IP the user uses and which reading mode the user uses.
Described here in Sect. 18 are the procedures for the correction for the user using the
IP of HR-BD type. Normally, the reading sensitivity of the HR type is automatically
calculated in the machine by the use of the sensitivity correction data for the ST type.
The sensitivity correction for the HR type is not required in this case, and only shading
correction described in Sect. 18.2 is performed. However, if the user uses only the
HR type, the procedures in Sect. 18.3 should be applied.
The procedures for correction for the user using HR-BD are described in Sect. 18.1.
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INSTRUCTION
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The adjustment procedures differ depending on the IP type used. Check the
procedures as appropriate.
{MU:5.3 [5-6] _Correction}
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NOTES
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- Of the IPs used by the user, the largest sized IP should be utilized for adjustment.
- The type of the X-ray tube and X-ray dose differ depending on the item to be
corrected.
Sensitivity correction: The X-ray tube is molybdenum and the X-ray dose is 20 mR.
Shading correction: The X-ray tube is tungsten and the X-ray dose is 15 mR.
18.1 Sensitivity Correction for IP Type HR-BD
(Both Side)
Supplemental explanation
The procedures for the correction for the user using HR-BD are described here.
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NOTE
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The IP must be read for a one-minute period from 10 to 11 minutes after the X-ray
exposure. Otherwise, correct correction on the sensitivity cannot be done. Exercise
care.
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INSTRUCTIONS
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- The calibrated X-ray dosimeter should be used to measure the X-ray dose.
- Correction of the reading must be done for a one-minute period from 10 to 11
minutes after the exposure.
REFERENCE
Exposure reference conditions (approx. 20mR)
Distance Voltage Amperage Time
Molybdenum X-ray tube 0.55m 25Kv 100mA 0.053 sec
1.
Using the X-ray dosimeter, measure the X-ray dose for exposing the
IP, and write it down.
2.
Expose an IP of 18"x 24" HR-BD (both side) or 24"x 30" HR-BD (both
side) size with a molybdenum X-ray tube (approx. 20 mR).