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The right choice: extremity dosemeter for different radiation fields.

N Brasik¹, H Stadtmann, P Kindl

¹ARC Seibersdorf Research GmbH, 2444 Seibersdorf, Austria.

Radiation Protection Dosimetry

|August 23, 2007

Summary

LiF:Mg,Cu,P (TLD700H) offers superior sensitivity and energy response for measuring beta radiation dose on extremities compared to LiF:Mg,Ti (TLD100). This thin thermoluminescent dosemeter is ideal for personal dosimetry in high-activity environments.

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Area of Science:

Radiation Dosimetry
Thermoluminescent Materials
Personal Monitoring

Background:

Measuring weakly penetrating radiation, particularly beta radiation, for personal dosimetry poses challenges in detector design and data interpretation.
Accurate assessment of individual beta radiation dose requires specialized personal dosemeters for extremities like fingers.
Lithium fluoride doped with magnesium, copper, and phosphorus (LiF:Mg,Cu,P) is a thermoluminescent material suitable for thin, sensitive detectors.

Purpose of the Study:

To compare the dosimetric properties of two extremity dosemeters designed for measuring personal dose equivalent Hp(0.07).
To evaluate the energy response of LiF:Mg,Ti (TLD100) and LiF:Mg,Cu,P (TLD700H) dosemeters to photon and beta radiation.
To assess the performance of these dosemeters in real-world workplace scenarios involving radiopharmaceuticals.

Main Methods:

Type testing for energy response according to ISO 4037-3 and ISO-6980 standards.
Simultaneous measurements using both TLD100 and TLD700H dosemeters at workplaces handling radiopharmaceuticals.
Analysis of dosemeter readings in relation to different radiation fields and handling practices (high activity, small source-skin distances).

Main Results:

The LiF:Mg,Cu,P (TLD700H) dosemeter demonstrated satisfactory sensitivity for detecting beta radiation at protection levels.
TLD700H exhibited a good energy response across various photon and beta radiation fields.
Comparison with TLD100 highlighted TLD700H's advantages for extremity beta dosimetry in specific occupational settings.

Conclusions:

LiF:Mg,Cu,P (TLD700H) is a highly suitable material for developing thin extremity dosemeters for beta radiation monitoring.
The TLD700H dosemeter provides reliable measurements of personal dose equivalent Hp(0.07) in environments with mixed radiation fields.
This study confirms the effectiveness of TLD700H for personal dosimetry in nuclear medicine and radiopharmaceutical handling.