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Volume 2 - Atomic Energy Regulatory Board

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3. TIMER CHECK<br />

Set time Observed time % Error<br />

Tolerance: ± 10 %<br />

4. ACCELERATING VOLTAGE<br />

Operating parameters : Distance : 40 - 50 cm<br />

Applied kVp<br />

60 kV (40 mAs)<br />

70 kV (32 mAs)<br />

80 kV (25 mAs)<br />

90 kV (20 mAs)<br />

100 kV (20 mAs)<br />

kV max (15 mAs)<br />

Measured kVp<br />

Tolerance : ± 5 kV<br />

5. LINEARITY OF mA LOADING STATION<br />

Operating parameters : Distance : 100 cm, kV : 60, Time : 1.0 second<br />

mA Out put Average mR/mAs<br />

Range<br />

(X)<br />

1 2 3<br />

100<br />

200<br />

300<br />

X max<br />

– X min<br />

Coefficient of linearity = ——————<br />

X max<br />

+ X min<br />

Tolerance : COL < 0.1<br />

241

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