Question 9 a) A patient receives an absorbed dose of 0.045 mSv of alpha radiation. The radiation weighting factor of the radiation is 20. Calculate the equivalent dose received by the patient. b) A worker in a nuclear power station receives the following radiation exposures to all parts of their body while working in one year: 1.5 mSv of slow neutrons, with a radiation weighting factor,, of 5 and 2.0 mSv of gamma rays with a of 1. What is the effective dose that the worker has absorbed? c) A patient has a CT scan of their abdomen with an absorbed dose of 25.0 mSv. The scan ends near the top of their pelvis. Assume that 15% of their bone is scanned, 20% of their skin, 90% of their colon, 25% of their bladder and 10% of their lungs but none of their liver, stomach, and gonads. A further 20% of tissue characterised as 'remainder of the body' is also exposed during the scan. The tissue weighting factors for various organs is listed in the table below: Tissue weighting factor skin 0.01 bone marrow 0.12 bone surface 0.01 brain 0.01 lung 0.12 liver 0.04 stomach 0.12 colon 0.12 Tissue Tissue weighting factor oesophagus 0.04 bladder 0.04 breast 0.12 _gonads 0.08 thyroid 0.04 salivary glands 0.01 remainder of body 0.12 Tissue
Question 9 a) A patient receives an absorbed dose of 0.045 mSv of alpha radiation. The radiation weighting factor of the radiation is 20. Calculate the equivalent dose received by the patient. b) A worker in a nuclear power station receives the following radiation exposures to all parts of their body while working in one year: 1.5 mSv of slow neutrons, with a radiation weighting factor,, of 5 and 2.0 mSv of gamma rays with a of 1. What is the effective dose that the worker has absorbed? c) A patient has a CT scan of their abdomen with an absorbed dose of 25.0 mSv. The scan ends near the top of their pelvis. Assume that 15% of their bone is scanned, 20% of their skin, 90% of their colon, 25% of their bladder and 10% of their lungs but none of their liver, stomach, and gonads. A further 20% of tissue characterised as 'remainder of the body' is also exposed during the scan. The tissue weighting factors for various organs is listed in the table below: Tissue weighting factor skin 0.01 bone marrow 0.12 bone surface 0.01 brain 0.01 lung 0.12 liver 0.04 stomach 0.12 colon 0.12 Tissue Tissue weighting factor oesophagus 0.04 bladder 0.04 breast 0.12 _gonads 0.08 thyroid 0.04 salivary glands 0.01 remainder of body 0.12 Tissue
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Transcribed Image Text:Question 9
a) A patient receives an absorbed dose of 0.045 mSv of alpha radiation. The radiation weighting factor of
the radiation is 20. Calculate the equivalent dose received by the patient.
b) A worker in a nuclear power station receives the following radiation exposures to all parts of their body
while working in one year:
1.5 mSv of slow neutrons, with a radiation weighting factor,, of 5 and 2.0 mSv of gamma rays with a of 1.
What is the effective dose that the worker has absorbed?
c) A patient has a CT scan of their abdomen with an absorbed dose of 25.0 mSv. The scan ends near the
top of their pelvis. Assume that 15% of their bone is scanned, 20% of their skin, 90% of their colon, 25%
of their bladder and 10% of their lungs but none of their liver, stomach, and gonads. A further 20% of
tissue characterised as 'remainder of the body' is also exposed during the scan.
The tissue weighting factors for various organs is listed in the table below:
Tissue weighting
factor
skin
0.01
bone marrow 0.12
bone surface 0.01
brain
0.01
0.12
0.04
0.12
0.12
Tissue
lung
liver
stomach
colon
Tissue weighting
factor
oesophagus
0.04
bladder
0.04
breast
0.12
gonads
0.08
thyroid
0.04
salivary glands
0.01
remainder of body 0.12
Tissue
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