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Disclaimers
We shall have no liability for any accident and damage arising from incorrect use and/or operation
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different from the content of the operating instructions.
We shall have no liability for any any accident and damage arising from modifications of this product
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without our permission.
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The minimum holding period of components for repair is generally 7 years after the product
discontinuation. However, they may not be available if manufacturers discontinued such as some
electronic components.
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Any duplication and use of all or any of the content of this document is forbidden.
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The descriptions in this document were created based on the data at the point of time of creating this
document and they may be different from the latest data as of your purchase date. Contact us if you
have any questions.
About the TLD reader
The TLD reader UD-7900 automatically measures a total of 500 badges (10 magazines, 50 badges per
magazine) inserted in magazines. Measurement data will be stored in a file and can easily be checked,
analyzed and used to create reports.
About this Document
This document provides operation procedures and safety precautions for operators of UD-7900.
Related-Manual
Software guide
About the Calibration Light Source
The TLD reader uses a calibration light source (CAL) that generates a weak light having constant and
stable light amount generated source to check the soundness of the photomultiplier tube. This calibration
light source is the sealed and solidified fluorescent material and radioactive substance "14C" using silicon
resin. The calibration light source is the sealed radiation source of approx.370 kBq (approx.10 μCi).
As for the legal treatment, this can be handled as a radiation source out of the scope of laws and
ordinances since the lower limit "14C" is 10 MBq.
However, since this contains a radioactive substance, it is recommended to dispose of the reader
separately from general wastes even though this is out of the scope of laws and ordinances,
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