Radioactive Contamination (GCSE Physics)

A Geiger counter registers 360 counts per minute (cpm). The square root uncertainty (counting statistic) roughly equals the square root of counts in one minute. What is the approximate uncertainty in cpm?

A patient receives a radioactive tracer that emits gamma rays. Which safety measure is most appropriate for staff after injection?

Which material is most effective for shielding alpha contamination on skin?

A sample has activity 800 Bq. After one half-life the activity will be:

If a contaminated area is cleaned by removing loose material and washing, which decontamination method is being used?

A worker is handling sealed radioactive sources. Which safety rule most reduces their radiation dose?

Which is the best shielding material to reduce exposure from gamma radiation in a laboratory?

Which of these reduces contamination spread when handling unsealed radioactive liquids?

Which statement about contamination control is correct?

Which type of detector is commonly used to measure alpha, beta and gamma radiation count rates in school labs?

Why is keeping a record (dosimeter readings) for workers important in a facility handling radioactive materials?