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A Collimator System for Scanning at Low Energies¹

Upton, New York

ABSTRACT

A special thin septa collimator has been designed for use with ^99mTc and other low-energy gamma-emitting isotopes in scanning. The basic 1''-thick collimator, designed for use with a 3'' detector, has 1045 holes, a 0.015'' septa thickness, a 3.5'' focal length and a 50% response diameter of 0.23''.

Variations of the basic collimator are made by making the unit thinner or thicker. Thinner collimators give an increased field of view resulting in higher counting rates, while increased thickness gives higher resolution with decreased sensitivity. Provisions have also been included for mounting masking rings or discs on the face of the collimator for use in altering the angle intercepted by the detector and thereby changing the depth response of the system.

A simple rapid technique has been developed for vacuum casting the collimator by melting lead around pins mounted in a base plate. Base plate and pins may be reused many times for additional castings.

FOOTNOTES

¹ This work was supported by the Atomic Energy Commission.

² Nuclear Engineering Department, Brookhaven National Laboratory, Upton, N. Y.

³ Medical Research Center, Brookhaven National Laboratory, Upton, N.Y.