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Answers test examination

RPO THK-basic

1 A 11 B 21 B 31 C
2 A 12 B 22 A 32 B
3 A 13 A 23 C 33 C
4 D 14 A 24 D 34 D
5 B 15 D 25 C 35 B
6 B 16 B 26 A 36 D
7 A 17 A 27 A 37 D
8 C 18 B 28 D 38 D
9 C 19 B 29 D 39 C
10 D 20 A 30 C 40 C

Evaluation of question 41:

Reading figure A at 90 kV and 3 mm aluminum
–› 0.08 mSv/mAs at 1 meter
The mAs value = 6 mA × 0.15 s = 0.9 mA s
The equivalent dose at 1 meter
–› 0.08 mSv/mA s × 0.9 mA s = 0.07 mSv
The equivalent dose at 25 cm = 0.25 m
–› 0.07 mSv × (1 m / 0.25 m)2 = 1.1 mSv

Evaluation of question 42:

Reading figure A at 70 kV and 3 mm aluminum
–› 0.05 mSv/mA s at 1 meter
The equivalent dose for 2000 / 2 = 1000 photos
–› 1000 × 0.05 mSv/mA s × 1.5 mA s = 75 mSv at 1 meter
The equivalent dose at 3 meters
–› 75 mSv × (1 m / 3 m)2 = 8 mSv
Reading figure B at 70 kV and 11 mm glass
–› T = 0.2
The annual effective dose on the street
–› 8 mSv × 0.2 = 1.6 mSv
Annual limit in case of registration = 10 µSv
–› insufficient shielding

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