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Radioactivity Crossword

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3 A couple of centimetres of this or about 1m of air will absorb beta rays from a source.
5 The [30 across] [13 across] is the number of protons inside the nucleus. This is the same for all atoms of a particular element. It is also termed the [5 across] [13 across].
7 A dense material like this is needed to shield a gamma ray source and reduce the count from it to a low level.
9 All radioactive particles are emitted from the _ _ _ _ _ _ of the atom.
11 A [11 across] [4 down] [24 across] is used to measure radioactive count.
13 The [30 across] [13 across] is the number of protons inside the nucleus. This is the same for all atoms of a particular element. It is also termed the [5 across] [13 across].
14 The process of decay is _ _ _ _ _ _ . Each radioactive atom in a sample has an equal chance of decaying. The laws of probability apply.
16 A radioactive particle made up of two protons and two neutrons.
19 The helical molecule that carries the genetic code. This can be altered by ionizing radiation.
20 [20 across] [17 down] is the time it takes for half of the radioactive atoms in a sample to decay.
22 Radioactive elements in the _ _ _ _ _ contribute to the background radiation.
24 A [11 across] [4 down] [24 across] is used to measure radioactive count.
28 [23 down] [28 across] from space contribute to the background radiation count.
29 If a radioactive substance is used to find the path something takes (through the body or in nature, say, the path of a stream) it is called a _ _ _ _ _ _
30 The [30 across] [13 across] is the number of protons inside the nucleus. This is the same for all atoms of a particular element. It is also termed the [5 across] [13 across].
31 Radioactive rays are _ _ _ _ _ _ _ _ They make neutral atoms gain a charge.
32 [32 across] [1 down] can be used to find out how old artefacts are.
33
The antimatter radioactive particle that is like an electron only positive!
34 This is the term that is used to describe what happens when a radioactive nucleus gives out radiation.

Clues Down:

1 [32 across] [1 down] can be used to find out how old artefacts are.
2 Gamma rays can be used in _ _ _ _ _ _ _ _ _ _ food and medical instruments. They kill bacteria.
4 A [11 across] [4 down] [24 across] is used to measure radioactive count.
6 A couple of sheets of this or 6 cm of air is enough to absorb alpha rays.
8 [8 down] [12 down] can be caused by ionizing radiation. That is why reproductive organs should always be carefully shielded when working with radiation.
10 This description of radioactive decay means that it is not possible for us to influence an atom (by changing pressure or temperature for example) and MAKE it decay.
11 Pure electromagnetic energy emitted from the nucleus of a radioactive atom.
12 [8 down] [12 down] can be caused by ionizing radiation. That is why reproductive organs should always be carefully shielded when working with radiation.
15 Gamma rays are the most _ _ _ _ _ _ _ _ _ _ _ because they produce the least localized ionization.
17 [20 across] [17 down] is the time it takes for half of the radioactive atoms in a sample to decay.
18 The [18 down] [13 across] is sometimes used for the nucleon number - the total number of nucleons (protons plus neutrons) in the nucleus. But really this term is used for the average nucleon number and can contain fractions!
21 One of these changes into a proton when a beta particle is emitted.
22 This is a radioactive gas that contributes to the background radiation count.
23 [23 down] [28 across] from space contribute to the background radiation count.
25 Radiation _ _ _ _ _ _ _ is the name of the treatment that kills tumours by bombarding cancerous tissue with ionizing radiation.
26 A radioactive particle that is identical in every way to an electron BUT originates from INSIDE the nucleus.
27 This can be caused by ionizing radiation

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