Biomedical Engineering Reference
In-Depth Information
this worker's exposure not exceed NCRP limits, what are now
the answers to parts (b) and (c) of the example?
16.
Calculate the effective dose for an individual who has received
the following exposures:
1 mGy alpha to the lung
2 mGy thermal neutrons, whole body
5mGygamma,wholebody
200 mGy beta to the thyroid.
The annual reference level of intake by inhalation for
32
Pis
1
17.
10
7
Bq.
×
(a)
What is the committed effective dose per unit activity for
the radionuclide?
(b)
If an amount of
32
P equal to the ARLI were ingested on
January 15, what would be the effective dose during that
calendar year?
18.
What is the value of the DRAC for
32
P from the last problem?
19.
Ingestion of a certain radionuclide results in a committed
effective dose of
5.2
×
10
-5
mSv Bq
-1
. What is the ARLI?
20.
Distinguish between lifetime equivalent dose and committed
equivalent dose.
10
3
Bq of a radionuclide,
a certain organ of the body will receive a dose during the next
50 y of 0.20 mGy from beta particles and 0.15 mGy from alpha
particles. The organ has a tissue weighting factor of 0.05.
(a)
21.
As a result of the single intake of
6.3
×
Calculate the committed equivalent dose to the organ.
(b)
If this organ is the only tissue irradiated, calculate the
committed effective dose.
(c)
What is the ARLI for this route of intake?
22.
Critique the probability of causation as a basis for attributing a
given case of malignancy to a prior exposure to radiation.
23.
If the excess relative risk for a certain cancer is 0.015 at a time
20 y after receiving a dose of 25 mGy, what is the probability of
causation?
24.
The BEIR-V Report estimated that about 800 extra cancer
deaths would be expected as a result of exposing a population
of 100,000 persons (of all ages) to a whole-body gamma dose of
0.1 Gy. About 20,000 deaths by cancer would be expected in the
population in the absence of radiation. How many persons
exposed to 0.1 Gy of gamma radiation would be needed in
order to observe such a level of excess cancers at the 95%
confidence limit?
