/pdf/thermoluminescence-dosimetry-application-in-environmental-3uvka6eyfo.pdf

Thermoluminescence Dosimetry-Application in Environmental Monitoring

Expansion of accelerator technologies into different application areas brings the need for neutron-field measurements in their vicinity The measurements of neutron energy spectra and neutron dose rates can be done with the aid of neutron multisphere spectrometers with passive neutron detectors In addition to the usually used thermoluminescent detectors and gold activation foils, another activation material-indium-can be considered This paper presents a design of such an indium-based neutron multisphere spectrometer Its response matrix was calculated with Monte Carlo code MCNP5 in the energy interval from 0001 eV to about 20 MeV The response matrix was validated with an Am-Be standard neutron source MAXED code was used for neutron energy spectra unfolding The values of the neutron fluence rate and neutron ambient dose equivalent rate in a reference point were calculated The properties and advantages of indium for use in neutron multisphere spectrometry are discussed

Calculation and Validation of the Response Matrix for a Neutron Multisphere Spectrometer with an Indium Central Detector.

Dopant concentration and thermoluminescence (TL) properties of tailor-made Ge-doped SiO2 fibres

Passive integrating dosemeters [thermoluminescent dosimeter (TLD) and optically stimulated luminescence (OSL)] are the only legally permitted individual dosemeters for occupational external radiation exposure monitoring in Korea. Also its maximum issuing cycle does not exceed 3 months, and the Korean regulations require personal dosemeters for official assessment of external radiation exposure to be issued by an approved or rather an accredited dosimetry service according to ISO/IEC 17025. KHNP (Korea Hydro & Nuclear Power, LTD), a unique operating company of nuclear power plants (NPPs) in Korea, currently has a plan to extend a TLD issuing cycle from 1 to 3 months under the authors' fading error criteria, ±10%. The authors have performed a feasibility study that minimises post-irradiation fading effects within their maximum reading cycle employing pre-heating technique. They repeatedly performed irradiation/reading a bare TLD chip to determine optimum pre-heating conditions by analysing each glow curve. The optimum reading conditions within the maximum reading cycle of 3 months were decided: a pre-heating temperature of 165°C, a pre-heating time of 9 s, a heating rate of 25°C s(-1), a reading temperature of 300°C and an acquisition time of 10 s. The fading result of TLD-600 and TLD-700 carried by newly developed time temperature profile (TTP) showed a much smaller fading effect than that of current TTP. The result showed that the fading error due to a developed TTP resulted in a ∼5% signal loss, whereas a current TTP caused a ∼15% loss. The authors also carried out a legal performance test on newly developed TTP to confirm its possibility as an official dosemeter. The legal performance tests that applied the developed TTP satisfied the criteria for all the test categories.

A method to minimise the fading effects of LiF:Mg,Ti (TLD-600 and TLD-700) using a pre-heat technique.

A simple method for avoiding fading correction of absorbed dose from glow curves of TLD-100

High pre- and post-irradiation fading prevents the attainment of high accuracy in dosimetry measurements, especially in routine dosimetry when the exact duration and time of exposure are not known. An attempt was made at the Soreq Dosimetry Centre to reduce the fading following or preceding gamma radiation, by employing a high post-irradiation preheat temperature of 150°C. Measurements of TLD-100, TLD-600 and TLD-700 were conducted during mild and hot seasons, for fading periods that varied from 1 to 27 weeks. Findings showed relatively little fading for both pre- and post-irradiation, with a slightly higher fading during the hot and humid season. One-month fading varied between 7% for TLD-100 and ∼10% for TLD-600 and TLD-700. Somewhat higher losses occurred after 3 months: ∼11% and ∼14%, respectively. The overall loss of the TL signal for the main type of dosemeter (TLD-100) issued for one month of use and 'in the field' for approximately two months, was 12 ±1% regardless of the actual time of exposure to gamma radiation during the issue period. A simultaneous comparison study that was carried out with a lower preheat temperature of 100°C showed a much higher post-irradiation fading. The loss of TL signal for TLD-100 due to storage following gamma irradiation was 19% and 22% for one and three months, respectively, thus lending support to the claim that the technique of high preheat temperature reduces the fading of LiF:Mg,Ti TL signal.

Low Pre- and Post-Irradiation Fading of LiF:Mg, Ti (TLD-100, TLD-600, TLD-700) Using a Preheat Technique

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Low Pre- and Post-Irradiation Fading of LiF:Mg, Ti (TLD-100, TLD-600, TLD-700) Using a Preheat Technique