In a liquid scintillation counter the light output from a liquid scintillation sample containing radioactive isotopes of unknown activity is measured by means of a detector. A pulse height analyzer ha
The time it takes the activity of a radioactive substance to get reduced to half of its initial value is called the half-life of the radioactive sample. If the decay constant of a radioactive substance is {eq}\lambda {/eq}, the h...
What period of time is required for a sample of radioactive sulfur-35 to lose {eq}59.75\% {/eq} of its activity? (The half-life of this sample is {eq}\rm 87.4\ days {/eq}.) Radioactive decay: When an unbalanced n...
To solve the problem step by step, we will follow the outlined approach based on the information provided in the question.Step 1: Understand the relationship between activity, mean life, and number of atoms The activity \( A \)
Constructed through a supramolecular assembly approach involving Fmoc-l-cysteine, heme, and Fe²⁺ coordination, HCFe distinctly incorporates heme and [Fe–S] within its active center. Sulfur coordination to the central Fe atom of Hemin is crucial in modulating the catalytic preference of the H...
Localization of functional activity in the central nervous system by measurement of glucose utilization with radioactive deoxyglucose. J. Cereb. Blood Flow Metab. 1, 7–36 (1981). PubMed CAS Google Scholar Wang, Z., Pang, R. D., Hernandez, M., Ocampo, M. A. & Holschneider, D. P...
The release of LDH was measured using the CytoTox 96 nonradioactive cytotoxicity assay kit (Promega, Madison, WI, USA). Cell lysates and supernatants were prepared to induce maximal LDH release and experimental LDH release, respectively, and incubated with substrate mixture in the dark at room te...
The latter method has certain unique advantages in quantitative microstudies: (a) radioactive methods are specific and their high sensitivity can be increased by using substrates of higher specific activities; (b) any drugs or other substances which may be present in the incubation medium often ...
determining a slope of radioactive emissions based on the plurality of measured activity values to determine an emissions slope; and determining a rate at which the radiopharmaceutical is replaced by the saline based on the emissions slope and the volume of the chamber, wherein the rate at which...
Half life of the nucleus is defined as the time taken to reduce the number of nuclei to half. In terms of the half life, the amount of radioactive substance as a function of time is given by the formula: {eq}R = R_0 \left( 1/2 \right)^{t...