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SErIES IAEA HumAn HEAltH SErIES IAEA Hum

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4. Dosimeter reading and calculation of entrance surface air kerma rate<br />

Phantom:<br />

Fluoro 3<br />

Selected option<br />

Tube<br />

voltage<br />

(kV)<br />

Tube<br />

current<br />

(mA)<br />

Filtration<br />

(mm Al)<br />

Manual or<br />

auto-mode<br />

(mm × mm)<br />

setting a Field size<br />

Dosimeter<br />

readings,<br />

M· 1, M· 2, M· 3<br />

(mGy/min)<br />

Mean<br />

dosimeter<br />

reading, M <br />

(mGy/min)<br />

surface air<br />

kerma rate, K· e b<br />

(mGy/min)<br />

k Q<br />

Entrance<br />

Enter M (manual) or auto-mode details.<br />

a<br />

b<br />

For water phantom use the following formula: <br />

T P<br />

Ke = MNKQ , kQ kTP<br />

, where k<br />

<br />

0<br />

TP = 273 . 2 +<br />

Á<br />

Ë + T<br />

˜ Ê 0 ˆ<br />

273 2 ¯ Ë<br />

Á<br />

P ¯<br />

˜ .<br />

. 0<br />

Ê<br />

ˆ<br />

For PMMA phantom use the following formula: <br />

B<br />

K MN k k<br />

w<br />

T P<br />

e = KQ , Q TP , where k<br />

k TP = 1 for systems with<br />

0<br />

TP<br />

B<br />

= 273 . 2 +<br />

Á<br />

PMMA<br />

+ T<br />

˜ Ê 0 ˆ<br />

Ë ¯ Ë<br />

Á<br />

P ¯<br />

˜ ;<br />

273 . 2 0<br />

automatic temperature and pressure corrections and for semiconductor dosimeters.<br />

Ê<br />

ˆ<br />

184

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