Fluke Biomedical 37-040 - Manual (Page 6)

Nuclear Associates 37-040 & 37-041
Operators Manual
1-2
that the exposed dosimetry media are likely to have archival qualities. This manual also contains specific
directions for the labeling of all dosimetry media samples.
1.3 Labeling
Unexposed dosimetry media should always be labeled with the batch number of the product. In addition,
a user label to identify the exposure conditions, date, time, etc., should always be used in conjunction with
an exposed dosimeter. The batch numbers provide an audit trail whereby process conditions and raw
materials can be identified and traced if a problem occurs.
The batch number is to be found printed on the package containing sheets of dosimetry media.
1.4 Handling
Unexposed and exposed dosimetry media should be handled only by the edges. It is recommended that
the paper covering the coated side be left on, until immediately prior to reading the dosimeters, to protect
the active coating. When writing on the media be careful not to exert pressure on the active area of other
sheets of dosimetry media.
Prior to reading the dosimetry media, visually inspect the reading area to ensure that there are no flaws or
marks, which might affect the reading. Remove loose particles by light rubbing with a lint-free paper or
cloth. If flaws or marks cannot be removed and readings cannot be taken in other areas of the dosimeter,
discard the dosimeter.
Unexposed dosimetry media should be handled by the edges or corners, taking care not to place
fingerprints in areas of the film that are to be imaged. Wearing cotton gloves while handling film is
recommended as the best way to avoid fingerprinting or scratching the film.
1.5 Storage of Unexposed Dosimeters/Dosimetry Media
1.5.1 Temperature
Where possible, store below 25°C (77°F). Although experiments have consistently shown that
GAFCHROMIC dosimetry media suffer no ill effects at temperatures up to 50°C (122°F), adherence to a
maximum storage temperature of 25°C (77°F) will provide the longest life. Never expose dosimetry media
to temperatures exceeding 65°C (149°F).
1.5.2 Relative Humidity
When the dosimetry media are kept below 25°C (77°F), they should be unaffected by any humidity below
100%. However, a dry storage location at 50% RH, or less, is preferred.
1.5.3 Visible Light
Unopened boxes of dosimeters/dosimetry media are adequately protected against all visible light
conditions. Although the dosimetry media have almost insignificant sensitivity towards visible light, it is
recommended that opened packages of the media be kept away from all unnecessary exposure to light,
particularly because visible light sources sometimes have an ultraviolet component that can be
deleterious to the dosimeters. Therefore, store unexposed dosimeters/dosimetry media in their packages,
with the covers closed.