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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.

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