SEARLE ANALYTIC INC Liquid Scintillation System Controller

Circa Early 1970's to Late 1970's (ESTIMATED)

This unit served as the operator interface for an automated liquid scintillation counter—a high-precision laboratory instrument. It is console, rack case, or equipment rack mountable. Indictors illuminate when powered up.

Use Cases:

• Medical Research & Clinical Labs: Used primarily for radioimmunoassay (RIA), which quantifies hormones or enzymes in blood samples using radioactive tracers.

• Nuclear Medicine: Automated counting of low-energy alpha and beta particle emissions in specialized "scintillation cocktails".

Rear Ports:

The unit features high-density D-subminiature connectors labeled for specialized laboratory functions:

• J1 & J2 Sample Changer: Controls the mechanical carousel that moves radioactive samples into the counting chamber.

• J3 Scaler: Interfaces with the high-speed pulse counter that tallies radioactive decay events.

• J4 Sample ID: Transmits identification data for each vial being processed.

• J2 Analyzer: Connects to the pulse height analyzer used to distinguish between different radioactive isotopes.

Historical Significance:

This unit represents a pivotal era in nuclear medicine when G.D. Searle expanded beyond pharmaceuticals into high-tech medical imaging and laboratory automation. Searle Analytic instruments were instrumental in the widespread adoption of hormone testing and early cancer research diagnostics. The company was later led by Donald Rumsfeld (1977–1985) before its medical instrument divisions were sold off or merged into what is now GE HEALTHCARE.

(H-9cm x W-48.5cm x D-48.5cm)