By National Council on Radiation Protection and Measurements
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Extra info for A Handbook of Radioactivity Measurements Procedures: With Nuclear Data for Some Biomedically Important Radionuclides
Counter pulses due to a beta-particle spectrum vary in size, by a factor of 1,000 or more when the counter is operated a t elevated pressure. , 1967). A characteristic that is used to measure the performance of a gaseous multiplication counter in the proportional region is the so-called plateau of the counter. As the applied voltage is increased, the increasing gas gain permits the triggering of the circuit discriminator by lower-energy primary ionizing events in the counter. When the applied 0 10 20 30 40 50 60 70 80 90 100 QUANTUM ENERGY OF THE ELECTROMAGNETIC RADIATION.
8. Voltage pulse from proportional counter. As described in the text, curve A represents the undifferentiated and curve B the differentiated responses. ) &. of the order of 1 ps. This delay time, which is variable, should not be overlooked when coincidence experiments are carried out. Initially the pulse rises very fast (curve A), first as a result of the movement of the electrons (tl to tz),then of the positive ions traveling in the strong field near the wire. As the positive ions move into the region of weaker field, the rise is slower and ceases when the ions reach the outer cylinder.
2 48 / 2. PHYSICS OF SOME RADIATION DETECTORS For practical applications three classes of quenchers may be distinguished, namely, diluting, chemical, and color quenchers. The first class consists of substances that dilute the mixture and thus reduce the probabilities of absorption of ionizing radiation by the solvent, and of the various energy transfer processes that follow the absorption of radiation. Aliphatic hydrocarbons and alcohols fall into this categoryChemical quenchers interfere in the scintillation process by deexcitation of the solvent.
A Handbook of Radioactivity Measurements Procedures: With Nuclear Data for Some Biomedically Important Radionuclides by National Council on Radiation Protection and Measurements
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