Lecture 9

Question 1

Occupational exposure for MIT?

Answer 1

0. 1-0.2 average

7. 2-8.7mSv

Question 2

Occupational exposure for RT?

Answer 2

0.5-1.0 average

1-37mSv

Question 3

Risk of fatal cancer

Answer 3

500 million/ 10mSv

MRT- 5-50 million

Question 4

total detriment?

Answer 4

of fatal cancer  of heredity factors for ALL future generations  and an allowance for non fatal cancer

Question 5

Why the difference between workers and the general population?

Answer 5

workers tend to be of reasonable health and in the prime age group (approx 20-60 years old)

Question 6

Annual mortality risk?

Answer 6

100 deaths/ million

Question 7

the risks of inducing fatal cancer are in the range of?

Answer 7

0.5 to 400 per million procedures for Medical imaging

Question 8

radiation from examinations?

Answer 8

• the benefit of diagnosis  -the time to receive a similar quantity of radiation from background radiation at sea level

Question 9

diagnostic radiology contributes

Answer 9

0.5 mSv of effective dose

2-3 million examinations annually

Question 10

detriment of diagnostic radiology

Answer 10

500 fatal cancers

100 heritable effects induced per yr

Question 11

Background radiation?

Answer 11

Cosmic rays 0.3 Radionuclides in soils 0.6 Radon progeny 0.2 Internal radionuclides 0.4 TOTAL 1.5

Question 12

benefits of low dose radiation?

Answer 12

life lengthening growth more offspring