This presentation delivers audit results for the use of TLD badges in the cath labs and includes information and reccomendations on how to use TLDs correctly

1. TLD BADGE
AUDIT
By: Chelsea Johnson

2. What is a TLD?
 A thermoluminescent dosimeter, or TLD,
is a type of radiation dosimeter.
 A TLD measures ionizing radiation exposure
by measuring the intensity of visible
light emitted by a crystal inside the detector
when the crystal is heated. The intensity of
light emitted is dependent upon the radiation
exposure.
 It was invented in 1954 by
Professor Farrington Daniels of the
University of Wisconsin-Madison.

3. How to wear TLDs
Whole body TLDs
measure dose to trunk.
Should be worn
between waist and
chest.
When wearing lead, it
should be worn close to
skin UNDER lead.

4. How to wear TLDs
Collar TLDs measure
dose to the head.
Should be worn
OUTSIDE thyroid collar.
It measures the
unshielded dose to
head.

5. Common TLD errors!
• Wearing whole body TLD as collar TLD vice versa
• Leaving TLD in sunny areas
• Travelling with TLDS
• Leaving TLDs in labs where they can be exposed to
radiation
• Not wearing TLD entirely
• Not exchanging TLD in timely manner
• Wearing other people’s TLDS

6. Remember !
 TLDs are considered a part of PPE
 Double check no TLDs are attached to lead
 Encourage colleagues in your team to
update TLDs
 Inform Radiographer if you are pregnant so
a separate foetal TLD can be issued.

7. What do my results mean ?
After you return your monitoring badges at the end of each quarter, the
badges are sent out to Mirion Technologies for processing.
EHS receives and reviews the dose reports several weeks after the end
of a monitoring period. EHS has established investigational levels at doses
that are 10% or less of the federal and state dose limits.
If a dose is reported that exceeds the investigational level, EHS will
contact you to determine whether the reported dose is likely to be accurate
and to investigate the causes of the dose in an effort to minimize dose in
the future.

9. Audit Results

10. Audit Results

11. Audit Results

12. Thank You!
 Be sure to click on the link below to answer the quiz for
your CPD certificate!
https://www.surveymonkey.com/r/VXRQ7DK