نتایج جستجو برای: scintillation counter
تعداد نتایج: 45455 فیلتر نتایج به سال:
A simple, inexpensive modification in the elevator mechanism of a liquid scintillation counter allows for radioimmunoassay tubes (12 X 75 mm) containing the antibody-bound radioligand to be counted directly, thereby obviating the need for counting vials and considerably decreasing the amount of fluor used. Furthermore, because assay and counting are all done in the same tube, the modification s...
Two radiostrontium isotopes, 89Sr and 90Sr, were measured simultaneously by liquid scintillation counter coupling with a full spectrum DPM counting protocol. Strontium was separated from the aqueous media by extraction chromatography using Sr-spec resin. Individual count rates were evaluated from quench correlation curves for 89Sr and 90Sr related with SIS and tSIE quench indicators. The method...
A faster radioimmunoassay of progesterone in plasma, with use of polyethylene glycol as precipitant.
We report a reliable radioimmunoassay for plasma progesterone in which polyethylene glycol ("Carbowax 6000") is used to separate antibody-bound and free hormone. Initially, progesterone is concentrated by putting the sample through a column of LH-20 Sephadex. Procedural losses in each sample are not monitored. We compared the reliability and practicality of this method with that of another meth...
Various water-soluble wavelength-shifting compounds were investigated to assess their suitability for the improvement of counting efficiency when ~erenkov radiation from phosphorous-32 is measured in a liquid scintillation counter. Of these compounds esculin, fl-methyl-umbelliferon and sodium salicylate led to the greatest improvement in counting efficiency. Especially esculin and fl-methyl-umb...
We have measured the performance, especially the timing properties, of micro-channel plate photo-multiplier tubes (MCP-PMTs) by irradiating with single photons with/without a magnetic field. A time resolution of s 1⁄4 30–35 ps was obtained for single photons under 1:5 T: With an MCP-PMT, a small time-of-flight counter, by means of Cherenkov light radiation instead of scintillation light has bee...
In this experiment we observe the distribution of radiation emitted by a Cs source. Using a scintillation counter, we count the number of gamma rays emitted by the radiation source at four different mean count rates: 1 sec−1, 4 sec−1, 10 sec−1, and 100 sec−1. From this we can plot the distribution of counts/sec versus the frequency of count rate. We find the distributions for the different mean...
were determined simultaneously in a dual-channel scintillation counter. The concentrations of inulin and PAH were determined by standard chemical techniques. The ratio of iothalamate 125I to inulin clearance ranged from 0.93 to 1.09 with a mean of 1.00. The ratio of iodopyracet 1311 to PAH clearance varied from 0.86 to 1.04 with a mean of 0.96. The chemical determination of PAH and inulin requi...
Determination of fraction biogenic component in liquid fuels by a direct radiocarbon measurement scintillation counter (direct-LSC method) has been validated participation the international intercomparison exercise. All results for samples with standard quench parameter SQP(E) value above ≈ 650 were accepted. Highly quenched sample used edible oil was diluted 14C-free petroleum ether to optimiz...
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