physics depth

Question 1

What is the main purpose

Answer 1

investigate the relationship between radiation intensity and distance from source, verifying the inverse square law

Question 2

Independent variable

Answer 2

distance from 137Cs source & GM tube

Question 3

Dependent variable

Answer 3

radiation count rate (N) by the GM tube

Question 4

Describe apparatus

Answer 4

included a 137C source (constant var.); GM tube (detects rad); optical bench; ruler; counter; timer. The counter recorded no of rad events detected by GM tube over an interval while time ensured consistent timing

Question 5

What is exposure

Answer 5

Amount of ionising radiation that interacts with specific area, such as tissue or air

Question 6

What is absorbed dose

Answer 6

amount of radiation energy absorbed per unit mass of material

Question 7

What is effective dose

Answer 7

measure of potential biological effect of absorbed dose

Question 8

How was data analysed

Answer 8

Data is gathered in exp. measuring background rad. We then total distance, and determined count rate.