Influence of radiation fluctuations on plasma tube impedance variations of a CO<sub>2</sub>laser

Nowicki, R.; Pienkowski, Janusz

doi:10.1088/0022-3727/15/7/011

Cited by 11 publications

(2 citation statements)

References 25 publications

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“…For unknown samples, the 14 CO 2 content can be determined using the obtained calibration. The calibration is nonlinear as the ICOGS effect is highly sensitive to pressure, discharge, and laser parameters so that standards are always required for the determination of unknown samples. Sources of error are minimized by temperature, pressure, gas flow, and discharge current stabilization.…”

Section: Icogs Experimental Systemmentioning

confidence: 99%

Laser‐based radiocarbon detection in the laboratory: How soon?

Murnick

2019

Labelled Comp Radiopharmac

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Research over the past 25 years and the use of accelerator mass spectrometry (AMS) have demonstrated benefits of single‐atom counting of 14C compared with scintillation monitoring of 14C radioactive decay for a multitude of applications in drug development studies. These include pharmacokinetics and metabolism studies, microdosing studies, and quantification of DNA adducts. In the last decade, the possibility of single‐atom counting using lasers has been demonstrated, providing the possibility of simplified laboratory‐based systems, which can equal or excel AMS sensitivity and provide scintillation system convenience without high levels of radioactivity. To achieve the required sensitivity, optical storage cavities have been used to enhance the laser interaction of the low densities of radiocarbon present. Two types of laser technologies have been used‐cavity ring‐down spectroscopy (CRDS) and intracavity opto‐galvanic spectroscopy (ICOGS). Problems to be overcome to achieve routine use have included separation of the 14C signal from backgrounds, achievement of acceptable precision and accuracy, reduction of measurement times for small samples, and improvement in the ease of use for the operator. Both technologies have achieved impressive results to date using samples of order 1 mg with CRDS and 10 μg with ICOGS. Commercial development is the next step.

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Section: Icogs Experimental Systemmentioning

confidence: 99%

Laser‐based radiocarbon detection in the laboratory: How soon?

Murnick

2019

Labelled Comp Radiopharmac

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“…Because of its efficiency Brooks 1979, Moffatt andSmith 1984), the changes in a COz laser are large and have been used to frequency stabilise both conventional (low pressure) CO2 lasers (Skolnick 1970, Thomason and Elbers 1975, Smith and Moffatt 1979) and waveguide lasers (Kavaya er a1 1982). Detailed studies of the effect have been carried out only in tow pressure discharges (Smith and Brooks 1979, Shimizu eta1 1983, Nowicki and Pienkowski 1982. The first two studies support the conclusion that the OGE in a CO2 laser is caused by changes in gas temperature (and hence resistivity) arising from variations in the collisional energy exchange rate between the two energy levels of the lasing transition and the background gas.…”

Section: Introductionmentioning

confidence: 97%