1) What is the relative ionising strength of beta radiation? a) Highly b) Moderately c) Acute d) Weakly 2) What is the penetration depth of alpha radiation in air? a) 2-5km b) 1km c) 2-3m d) 2-3cm 3) What material can be used to stop gamma radiation? a) Air b) Aluminum c) Lead d) Paper 4) What standard unit is used to measure the activity of a radioactive sample? a) Rontgens b) Sievert c) Becquerel d) Curie 5) What is the name given to the machine used to measure the activity of a source?  a) Curie Counter b) Geiger Counter c) Muller Counter d) Rontgen Counter 6) What is the red arrow pointing at? a) Muller-Rontgen Tube b) Geiger-Rontgen Tube c) Geiger-Muller Tube d) Argon-Geiger Tube 7) Which decay equation correctly shows the emission of alpha decay? a) b) c) d) 8) Which decay equation correctly shows an atom with too many neutrons decaying? a) b) c) d) 9) A radioactive source’s activity falls from 4000 counts per minute to 500 counts per minute in 6 hours. Calculate its half-life. a) 2 hours b) 18 hours c) 1 hour d) 48 hours 10) Estimate the radioactive half-life of this radioisotope. a) 12 days b) 16 days c) 4 days d) 8 days

Established - Radioactivity

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