Related Experiment Video
Updated: Jun 5, 2026
10:20
Quantification of Heavy Metals and Other Inorganic Contaminants on the Productivity of Microalgae
Published on: July 10, 2015
Long-term stability of Harshaw LiF:Mg,Cu,P TLDS
P J Gilvin1, R A Burkett, S T Baker
1Health Protection Agency, Chilton, Oxon OX11 0RQ, Didcot, UK. phil.gilvin@hpa.org.uk
Radiation Protection Dosimetry
|January 11, 2011
Summary
The sensitivity of Harshaw™ magnesium/copper/phosphorus-doped lithium fluoride thermoluminescent dosimeters (TLDs) remains stable over extended periods. This stability is maintained even with infrequent readings, such as three times annually in practical applications.
Area of Science:
- Materials Science
- Radiation Detection
Background:
- Thermoluminescent dosimeters (TLDs) are crucial for radiation monitoring.
- Lithium fluoride (LiF) doped with magnesium, copper, and phosphorus is a common TLD material.
- Long-term stability of TLD sensitivity is essential for accurate retrospective dosimetry.
Purpose of the Study:
- To evaluate the long-term stability of Harshaw™ TLDs.
- To assess the impact of infrequent readout on TLD sensitivity.
- To confirm the reliability of these TLDs for practical radiation monitoring applications.
Main Methods:
- Utilized Harshaw™ magnesium/copper/phosphorus-doped lithium fluoride TLDs.
- Subjected TLDs to controlled radiation exposure.
- Performed TLD readout at intervals, simulating practical operational conditions (e.g., three times per year).
- Monitored TLD sensitivity over extended time periods.
Main Results:
- Demonstrated consistent and stable sensitivity of the TLDs over long durations.
- Observed no significant degradation in sensitivity despite infrequent readout cycles.
- Confirmed the reliability of the TLDs under conditions mimicking real-world usage.
Conclusions:
- Harshaw™ magnesium/copper/phosphorus-doped lithium fluoride TLDs exhibit excellent long-term stability.
- The TLDs maintain reliable performance even with limited readout frequency.
- These findings support the continued use of these TLDs in various radiation monitoring scenarios.
Related Concept Videos
01:09Complexation Equilibria: Factors Influencing Stability of Complexes
In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
03:18Nuclear Stability
Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters.
To hold positively charged protons together in the...
To hold positively charged protons together in the...
01:16Drug Product Stability
The long-term stability of drug products is critical to ensuring their quality, safety, and effectiveness over time. Stability directly influences a product's ability to maintain its intended characteristics, ensuring it performs as expected during its intended shelf life. Key attributes such as drug potency, impurities, dissolution, and other physicochemical measures of performance are tested to assess stability. These parameters indicate how well the product retains its quality over time and...
00:56Extraction: Advanced Methods
Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is formed in...