exercises (mixed)

These question include information from the start of this part of the booklet so don’t forget to look back a few pages.

64. A teacher is using a GM-counter to measure the radioactivity of a rock. Wrapping the rock in paper doesn’t affect the count but wrapping it in aluminium does. What type of radiation is being emitted by this rock?

65. What type of radiation penetrates through paper and aluminium but not through thick sheets of lead?

66. What device used alpha radiation (but no longer)?

67. Which type of radiation can be used to sterilise surgical equipment?

68. What is de danger of a dose between large and small?

69. What is the danger of a large dose of radiation?

70. What does “to ionise” mean?

71. Why is an alpha source less dangerous than a beta source when the source is located 1 metre away from you?

72. Where do you find radioactive materials?