A Handbook of Radioactivity Measurements Procedures NCRP by National Council on Radiation Protection and Measurements

By National Council on Radiation Protection and Measurements

The name of this e-book is A instruction manual of Radioactivity Measurements methods: With Nuclear information for a few Biologically vital Radionuclides : strategies of the nationwide Council on Radiation safety and Measurements and it used to be written by way of nationwide Council on Radiation safety and Measurements, nationwide Committee on Radiation safeguard and Measurements (U.S.). This variation of A guide of Radioactivity Measurements strategies: With Nuclear facts for a few Biologically very important Radionuclides : concepts of the nationwide Council on Radiation safeguard and Measurements is in a e-book structure. This books submit date is January 1, 1978. It was once released through NCRP and has 506 pages within the e-book. the ten digit ISBN is 0913392413 and the thirteen digit ISBN is 9780913392416

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Extra info for A Handbook of Radioactivity Measurements Procedures NCRP Reports 58

Example text

Spectral matching factors, m = J r I(A)7(A)dA/Jo"I(X)dX, were taken from Birks (1975). The values of I(X), the emission spectrum, were obtained from dilute solutions of the solutes in toluene and values for v(A), the phototube response, for bialkali phototubes. 'Solubilities are given here only for comparative purposes, since most data have been taken from suppliers' literature and wide variations were noted for several compounds. Suggested optimum concentrations for many of these solutes may be found in Birks (1964) and Horrocks (1974).

This energy is subsequently transferred to the solute (or fluor) and is re-emitted as photons in the violet and ultraviolet. These photons, having an average wavelength characteristic of the solute, can then be detected at the photocathode of one or more phototubes, although in the general application of the method a "wavelength shifter" may also be used to produce an output pulse of photons having wavelengths compatible with the optimum sensitivity of the photocathode. Following amplification in the phototube, the signal may be routed to additional amplifiers and finally recorded with a suitable counter such as a single-channel or multichannel analyzer.

1983). Future developments may lead to the replacement of phototubes by semiconductor devices in more routine applications. 4 Output-Pulse Processing As outlined above, the electron-multiplier phototube embodies two functions that are essential to the performance of a scintillation detector: (1) the detection and conversion of the light emitted by the phosphor into a pulse of electrons; and (2) the amplification of this minute amount of current to a level that can be suitably handled in conventional electronic-amplifier circuits.

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