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A new design for a liquid scintillation counter for micro samples using a flat-bed geometry.

G T Warner, C G Potter, T Yrjonen

The International Journal of Applied Radiation and Isotopes

|October 1, 1985

Summary

A novel flat-bed liquid scintillation counter design offers low background counts and reduced radioactive waste. This efficient system is ideal for micro-sample analysis in various research applications.

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Area of Science:

Biomedical instrumentation
Radiochemistry
Analytical chemistry

Background:

Traditional liquid scintillation counters can be resource-intensive.
Micro-sample analysis requires sensitive and efficient detection methods.

Purpose of the Study:

To introduce a new flat-bed liquid scintillation counter design.
To evaluate its performance for micro-sample analysis.

Main Methods:

Samples are prepared on a 6 X 16 matrix using transfer membranes or glass fibre filters.
A prototype counter was tested without lead shielding.
Background count rates and figures of merit for tritium (3H) and carbon-14 (14C) were measured.

Main Results:

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The prototype exhibited low background count rates (2-3 cpm for 3H).

High figures of merit were achieved: 1325 for 3H and 1292 for 14C.

Low scintillant volumes (5-15 ml/96 samples) were required, minimizing radioactive waste.

Conclusions:

The flat-bed liquid scintillation counter design is effective for micro-sample analysis.
It offers high sensitivity and efficiency with reduced waste generation.
This design presents a cost-effective and environmentally conscious alternative for radioassays.