Question about determining the fold structure and maximum radon risk. Please ope

Question

Question about determining the fold structure and maximum radon risk.

Please open the link below to get the map:
http://www.largeimages.bgs.ac.uk/iip/mapsportal.html?id=1003959

- A fold structure resulted in the limestone outcrop in the vicinity of 344560. Describe the type of fold and determine the trend of the fold axial plane.

- The uppermost limestone in this area contains traces of uranium minerals which result in high radon fluxes, with soil gas radon reaching 76 kBqm-3, a value that will result in exposures that exceed the UK Radon Action Levels. Identify and explain the areas of maximum radon risk within grid square 300570. (The grid reference refers to the SW corner of the grid square to be considered).

Explanation / Answer

1) Monoclines may be formed By differential compaction over an underlying structure, particularly a large fault at the edge of a basin due to the greater compactibility of the basin fill, the amplitude of the fold will die out gradually upwards.

The axial plane of a fold is the plane or surface that divides the fold as symmetrically as possible. The axial plane may be vertical, horizontal, or inclined at any intermediate angle. An axis of a fold is the intersection of the axial plane with one of the strata of which the fold is composed.

2) the areas are duke's drive, darley, eddlestown east hale

Radon is a naturally occurring radioactive gas produced by the decay of uranium 238, which is present throughout the Earth's crust. Radon is responsible for the majority of the mean public exposure to ionizing radiation. It is often the single largest contributor to an individual's background radiation dose, and is the most variable from location to location. Radon gas from natural sources can accumulate in buildings, especially in confined areas such as attics, and basements. It can also be found in some spring waters and hot springs

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