A NEW APPROACH TO RADIOASSAY OF AQUEOUS SOLUTIONS IN THE LIQUID SCINTILLATION SPECTROMETER
Journal Article
·
· Analytical Biochemistry (U.S.)
A new two-phase counting method is described that permits radioassay of aqueous solutions in the liquid scintillation spectrometer. The sample in solution is pipetted onto crystals of anthracene in a standard counting bottle, and the fluorescent emission is counted. The general features of the technique are discussed from a theoretical and practical point of view. Efficiencies as high as 54% for small volumes of C/sup 14/ samples can be obtained. In the routine procedure described the C/sup 14/ in 3 ml of sample is counted with approrimately 20% efficiency. Efficiencies for H/sup 3/, Ca/sup 45/, P/sup 32/, and I/sup 131/ are presented. The efficiencies for C/sup obtained with several other solid fluors, including a plastic scintillator, are presented. The advantages of the method over existing methods are several. It is general and applicable to virtually any compound soluble in water, salt solutions, dilute acid, or dilute alkali; no chemical conversion or other preliminary handling is necessary, and sample preparation is simple and rapid; samples can be recovered unaltered after radioassay and used for further characterization; and large quantities of sample can be counted, limited only by their solubility in the liquid phase, and, in the case of colored compounds, by quenching effects. (auth)
- Research Organization:
- National Heart Inst., Bethesda, Md.
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-14-017864
- OSTI ID:
- 4149529
- Journal Information:
- Analytical Biochemistry (U.S.), Journal Name: Analytical Biochemistry (U.S.) Vol. Vol: 1; ISSN ANBCA
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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