Measurements

Download e-book for kindle: A Handbook of Radioactivity Measurements Procedures, 2nd by National Council on Radiation Protection & Measurements

By National Council on Radiation Protection & Measurements (Editors)

ISBN-10: 0913392715

ISBN-13: 9780913392713

ISBN-10: 1601192517

ISBN-13: 9781601192516

This record addresses the size of radioactivity and bargains with the gigantic 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, resembling air and water, in reference to the regulate of radioactive effluents linked to the creation of nuclear strength or using radionuclides.
Content:
• entrance subject
• 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. thoughts for the coaching of ordinary assets for Radioactivity Measurements
6. The Assay of Radioactivity and the identity of Radionuclides in Environmental, scientific, and commercial Laboratories
7. information
eight. Measurements insurance, criteria, Traceability and the assertion of Uncertainty
Appendix A: Nuclear-Decay info for chosen Radionuclides
Appendix B: The facts of Radioactive Decay
• References A-J
• References K-Z
• The NCRP
• NCRP guides
• Index

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

Sample text

5) where p(t) is the total number of photons emitted a t time t. The decay time T is characteristic of the scintillator and determines the rise time of pulses produced a t the output of the phototube. Decay times, to 11 e, are of the order of 1 ps or less for inorganic scintillators. 2 to 10 ns. Anthracene crystal has a decay time of about 30 ns, and naphthalene 75 ns. In addition to the time response, a major consideration in the performance of a phosphor as a scintillation detector is the absorption of the light emitted by the scintillation process in traversing the scintillator material.

See Eq. 35 et sea. 4 Loss-of-Charge Method. For charged-particle emitters the loss-of-charge method allows the number of such particles emitted to be calculated from a measurement of the charge transfer. Since the method is rather insensitive, it is not recommended for practical use. 5 Activity from Production Data. The activity of a radionuclide produced in a particular irradiation may be calculated approximately from irradiation, cross-section, and decay-scheme data. 6 Indirect or Relative Methods of Radioactivity Standardization In the national standardizing laboratories, the calibration data for many radionuclides (particularly a short-lived radionuclide) are usually preserved by using a standardized source to calibrate a reference instrument such as an ionization chamber.

PHYSICS OF SOME RADIATION DETECTORS TABLE 2-Average Radiation energy expended i n the production of an ion pair in air Reference Wd. 0 Jesse and Sadauskis, 1955 Bay et al.. 1957 Gross et al.. 1957a Jesse and Sadauskis, 1955 Weiss and Bernstein, 1955 Jesse and Sadauskis, 1953 Bortner and Hurst, 1954 --------------- - ---- - ---SATURATION CURRENT k z W a a 3 w z 0 l- a N z 0 VOLTAGE Fig. 5. Saturation curve (ionization current versus collecting voltage) for a typical ionization chamber. depend on the rate at which ionization is being produced and on the rate of recombination.

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


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