By National Council on Radiation Protection
This file was once formulated in acceptance of the truth that implementation of options for the safety of employees and the general public, in addition to demonstration of compliance with the necessities of regulatory organizations, calls for instrumentation and methods for the dimension and evacuation of radiation fields and radioactive infection. right calibration approaches are, in fact, an important requirement for powerful dimension and overview. This file is concentrated at the calibration of moveable tools utilized in dose identical evaluation and the evaluate of floor infection. The file outlines the concepts and methods essential to represent the specified responses of assorted survey tools via applicable calibration techniques.
desk of Contents
2. concerns within the Calibration method
three. Calibration Facility
four. Calibration of Photon Measuring tools for exterior Radiation box evaluate
five. Calibration of Beta Dose-Measuring tools for exterior Radiation box review
6. Calibration of moveable tools for the overview of Neutron Radiation Fields
7. Calibration of box Instrumentation for the evaluation of floor illness
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Extra resources for Calibration of Survey Instruments Used in Radiation Protection for the Assessment of Ionizing Radiation Fields and Radioactive Surface Contamination
3 Directional or Angular Response Many instruments and detectors exhibit responses which are dependent on the angle of incidence of radiation on the instrument or detector. The size, shape, and chamber construction each affect the angular response. A complete calibration includes evaluation of the response of each instrument to radiation incident upon the chamberldetector from different angles. This information is essential in evaluating the response of the instrument to various field situations.
1). 072 a t the "95 percent confidence level". In the determination of R, then, the overall uncertainty a t the "95 percent confidence level7'is reported as Appendix F provides information on sources of systematic uncertainties and includes a n example illustrating the propagated influence of such uncertainties on the value of R. 4 Instrument Stability The quantity R represents a measure of the accuracy with which the test instrument reads in the calibration field. , the deviation from the ideal response) is quoted 34 1 2.
05 mSv h- l. For instruments intended for assessment of surface contamination the value of uI/f should not exceed + 20 percent. 5). When personnel dose control is not a major reason for making field measurements, restrictions on instrument stability may be less important. Instrument drift represents an instability which may bias readings obtained with the instrument. 17A specify acceptable drift allowances (ANSI, 1989b). If a n instrument has a history of stable operation and, after a warmup time specified by the manufacturer, shows no sign of drifting, it may be assumed acceptable for calibration.