Give the definitions of the notions below

1. chart is …

2. axis is …

3. average thermal neutron absorption cross section is …

4. thermal neutron activation cross section is …

5. neutron-to-proton ratio is …

Work in pairs. Complete the table below.

Translate the sentences below paying attention to the emphatic constructions.

It is... that (which, who)

Example:

1. It was the temperature change that accounted for the resistance change.

Именно изменение температуры объяснило (обу­словило) изменение сопротивления.

2. It was Kamcrlingh Onnes who anticipated large scale application of superconductivity. Именно К. Оннес предвидел использование сверхпроводимости в больших масштабах.

1. It was this accuracy that enabled us to detect the errors as small as+ 2 percent.

2. It was De Broglie who suggested in 1924 that moving particles, e.g. electrons, should exhibit properties of waves.

3. It was owing to this remarkable invention that we have avoided auxiliary operations.

4. It is this ancient alloy that is likely to contain distinct traces (след) of radioactivity.

5. It is because the Maxwell equations are invariant under those transformations that they can be written in a beautiful form.

6. It is after the discovery of X-rays that these conditions could be arrived at (достичь, приводить к).

Make up a report on the topics below.

«The Arrangement of the Elements in the Chart of the Nuclides»

(See appendix 4)

TEXT 3

Before reading the text below complete the sentences 1-3.

1. Natural uranium …

2. Enriched uranium …

3. Depleted uranium …

For spaces 1-5, read the text below and decide which answer A, B or C best fits each space.