Identification of an unusual gamma counter fault using Trigg's technique for trend detection.

Abstract:

:A simultaneous deterioration in performance of several radioimmunoassays suggested that equipment was malfunctioning. Replicate counts from an automated gamma counter showed unacceptable variation during a 24-hour period; this variation was detected using Trigg's technique, a sensitive method for trend analysis, and was not identified by the usual laboratory testing procedures. A defective capacitor was found in the voltage stabilisation unit in the gamma counter, which probably made it responsive to small variations in the power supply to the laboratory. It is suggested that the analysis of replicate counts using Trigg's technique is a valuable test of gamma counter function which should become routine.

journal_name

Ann Clin Biochem

authors

Challand GS,Cox L

doi

10.1177/000456327801500126

subject

Has Abstract

pub_date

1978-03-01 00:00:00

pages

117-20

issue

2

eissn

0004-5632

issn

1758-1001

journal_volume

15

pub_type

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