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Volume 2 - Atomic Energy Regulatory Board

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6. LINEARITY OF TIMER<br />

Operating parameters : Distance : 100 cm, kV : 50, mA : 200<br />

Time Out put Average mR/mAs<br />

(X)<br />

1 2 3<br />

0.5<br />

1.0<br />

1.5<br />

X max<br />

– X min<br />

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

X max<br />

+ X min<br />

Tolerance : COL < 0.1<br />

7. OUTPUT CONSISTANCY<br />

Operating parameters : Distance : 100 cm<br />

Applied mA Output Average<br />

kV<br />

(X)<br />

1 2 3 4 5<br />

70<br />

80<br />

100<br />

120<br />

Coefficient of variation = [ ∑ (Xi - Xmean) 2 /(n-1)] 1/2 / Xmean<br />

COV =<br />

————— for ———— kV<br />

————— for ———— kV<br />

————— for ———— kV<br />

————— for ———— kV<br />

————— for ———— kV<br />

Tolerance : COV < 0.05<br />

242

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