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Line 1: − '''1''': Measurements are made with the reference standard chamber to determine air kerma rate under reference conditions at the time of calibration. − + + + + + + + + − In '''Step 1''', the air kerma rate, ''K<sub>a</sub>'', at the point of measurement is determined according to the equation: − − (1) − − where is the calibration coefficient of the reference standard as calibrated by NRC for air kerma, and is the corrected meter reading of the reference standard as given by Eq. 3, under the conditions specified in this instruction. The correction factors usually applied at the time of calibration are ''P<sub>TP</sub>'' and ''P<sub>1eak</sub>''. − − In the '''step 2''', the calibration coefficient of the working standard is obtained according to: − − (2) − − Where is the corrected meter reading of the working standard under the identical conditions of measurement as those established for the measurement of air kerma rate, ''K<sub>a</sub>'', given by Eq. 1.<nowiki><multilang> </nowiki> − @en|
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'''Step 2''': Measurements are made with the working standard for calibration by substitution.
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