Measurements

Read e-book online A Handbook of Radioactivity Measurements Procedures, 2nd PDF

By National Council on Radiation Protection & Measurements (Editors)

ISBN-10: 0913392715

ISBN-13: 9780913392713

ISBN-10: 1601192517

ISBN-13: 9781601192516

This file addresses the size of radioactivity and bargains with the big variety of assorted radioactive fabrics that experience develop into on hand within the final 3 many years, from nuclear reactors and particle accelerators, for purposes in drugs, medical learn, and undefined. It additionally addresses low-level radioactivity measurements for the tracking of radioactivity in environmental media, corresponding to air and water, in reference to the keep watch over of radioactive effluents linked to the construction of nuclear strength or using radionuclides.
Content:
• entrance topic
• Preface to the 1st version
• Preface to the second one variation
• desk of Contents
1. creation
2. Physics of a few Radiation Detectors
three. primary or Direct Measurements of task in Radioactive Decay
four. oblique or Comparative Measurements of job in Radioactive Decay
five. ideas for the coaching of ordinary assets for Radioactivity Measurements
6. The Assay of Radioactivity and the identity of Radionuclides in Environmental, clinical, and business Laboratories
7. facts
eight. Measurements coverage, criteria, Traceability and the assertion of Uncertainty
Appendix A: Nuclear-Decay info for chosen Radionuclides
Appendix B: The records of Radioactive Decay
• References A-J
• References K-Z
• The NCRP
• NCRP guides
• Index

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Additional resources for A Handbook of Radioactivity Measurements Procedures, 2nd edition

Example text

1 Gas-Scintillation Counters. Perhaps the most common effect observed due to the passage of ionizing radiation through gases is the emission of light. Light may be readily observed, for example, from electric discharges or from an intense beam of charged particles passing through a gas. As ionizing radiation passes through a gas, ion pairs and electronic excitations are produced in the molecules and atoms. The electronic excitation energy may then be given up either by nonradiative collision or by photon emission.

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.

The chamber, therefore, measures the integrated effect of a large number of ionizing events. The time constant of the current-detecting device is generally made long to suppress statistical fluctuations, and whether the electrons are collected as free electrons (as, for example, in argon), or attached to slow-movingmolecules as ions (as, for example, in oxygen), is of no importance. However, the probability of recombination is lower in a gas in which negative ions are not formed, and saturation can be reached with a lower field strength.

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A Handbook of Radioactivity Measurements Procedures, 2nd edition by National Council on Radiation Protection & Measurements (Editors)


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