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The collection therefore includes a vast library of printed images for many of the genera encountered The palaeontological value of an extant collection lies in helping us to understand the prevailing environmental conditions of the last c. Pollen grains and spores are found in most sedimentary deposits and have been around since pre-Cambrian times, making them reliable dating tools.As many species require specific environmental conditions to survive, their presence in the fossil record can reveal changes in climate.Radioactive sources (most commonly Technetium-99 or sometimes Iodine-123) can be used by doctors to find out if different organs in our bodies are working properly (eg. Doctors can inject a small amount of radioactive substance into a patient's body.This substance is carried by the blood to the organ, eg the kidneys or the thyroid gland, that the doctor wants to examine. Tracers are chosen which will concentrate in the part of the body to be investigated, and the tracer's radiation will also be concentrated there.Gamma rays can easily penetrate pipes (even if they are underground) and reach the detector.Both alpha and beta particles would not pass through pipes, so could not be used.

The numbered tables were cautiously arranged to allow participants to easily move around and interact with the next person and each one was given a number to be recognized by the opposite sex.

Each slide contains labelled examples of pollen and/or spores from key extant (living) northwest European flora.

Much of the collection has been imaged using both traditional light microscope and scanning electron microscope (SEM) equipment.

You've heard about people seeing their lives flash before their eyes.

In this interactive, it's an isotope's half-life you watch speed past.

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