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[[File:CNSNLabISO Banner 36.pdf|thumb]]
[[File:CNSNLabISO Banner 36.pdf|thumb]]
[[File:CNSC ISO Banner.png|center|thumb|1318x1318px]]
[[File:CNSC ISO Banner.png|center|thumb|1318x1318px]]
<nowiki><multilang> </nowiki>
'''1''': Measurements are made with the reference standard chamber to determine air kerma rate under reference conditions at the time of calibration.
'''Step 2''': Measurements are made with the working standard for calibration by substitution.
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>
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''P<sub>rp</sub>'' is the correction factor to account for radial variation in the intensity profile of the radiation field over the sensitive volume of the ionization chamber. ''P<sub>rp</sub>'' is taken to be unity under the circumstances of the calibration.
''P<sub>rp</sub>'' is the correction factor to account for radial variation in the intensity profile of the radiation field over the sensitive volume of the ionization chamber. ''P<sub>rp</sub>'' is taken to be unity under the circumstances of the calibration.
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'''1''': Measurements are made with the reference standard chamber to determine air kerma rate under reference conditions at the time of calibration.
'''Step 2''': Measurements are made with the working standard for calibration by substitution.
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.
