ANNEX 4
A4. DOSIMETRIC INDICATIONS
The radiation exposure is reported in terms of Dose Area Product (DAP), which takes into account the entire
area of the X-ray beam and the total amount of X-ray radiation incident on the patient. The DAP is obtained
by multiplying the Air Kerma by the corresponding X-ray beam area, which is dependent by the typology of
beam limiting device installed. It is independent by the measured location, because increases in beam area are
compensated by the reduction of beam intensity (inverse square law).
The dosimetric values reported here are relevant to the following measured values of Total Filtration and Half
Value Layer (HVL):
kV HVL (mm Al) Total Filtration (mm Al)
70 2,0 2,3
In the following tables the radiation exposure is indicated in terms of DAP [mGy cm2] for each setting of kV, beam
limiting device length (SSD) and Beam Limiting Device type (circular or rectangular).
As per paragraph 203.6.4.5 of the IEC 60601- 2-65, the overall deviation from the estimated air kerma is within
50%.
Cone type Circular Long Short Circular Rectangular Long
SSD (mm) 310 200 310
kV 70 70 70
mA 8 8 8
Time (s) DAP (mGy*cm2) DAP (mGy*cm2) DAP (mGy*cm2)
0,08 5,559 13,597 3,458
0,1 6,949 16,996 4,323
0,125 8,686 21,246 5,403
0,16 11,118 27,194 6,916
0,2 13,897 33,993 8,646
0,25 17,372 42,491 10,807
0,32 22,236 54,388 13,833
0,4 27,795 67,986 17,291
0,5 34,744 84,982 21,614
0,63 43,777 107,077 27,234
0,8 55,590 135,971 34,582
1 69,487 169,964 43,228
1,25 86,859 212,455 54,035
1,6 111,179 271,942 69,165
2 138,974 339,928 86,456
2,5 173,718 424,910 108,070
3,2 222,358 543,885 138,329
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