(EDTA) Ethyl diamine tetra acetic acid is used in decontamination applications as well as for the kidney clearance in connection with 99mTc to assign the glomerular kidney filtration.

European Medicines Agency (EMEA) is a decentralized body of the European Union with headquarters in London.
'The EMEA began its activities in 1995, when the European system for authorizing medicinal products was introduced, providing for a centralized and a mutual recognition procedure. The EMEA has a role in both, but is primarily involved in the centralized procedure. Where the centralized procedure is used, companies submit one single marketing authorization application to the EMEA. A single evaluation is carried out through the Committee for Medicinal Products for Human Use (CHMP) or Committee for Medicinal Products for Veterinary Use (CVMP). If the relevant Committee concludes that quality, safety and efficacy of the medicinal product is sufficiently proven, it adopts a positive opinion. This is sent to the Commission to be transformed into a single market authorization valid for the whole of the European Union.'
'Its main responsibility is the protection and promotion of public and animal health, through the evaluation and supervision of medicines for human and veterinary use. The EMEA coordinates the evaluation and supervision of medicinal products throughout the European Union. The Agency brings together the scientific resources of the 25 EU Member States in a network of 42 national competent authorities. It cooperates closely with international partners, reinforcing the EU contribution to global harmonization.'

The excretion of body wastes and toxic substances are the primary function of the kidneys. The functional excretion unit is the nephron. Each kidney contains about one million nephrons. The nephron has three primary regions that function in the renal excretion process, the glomerulus, proximal tubule, and the distal tubule.
The kidney clearance is a measurement of the renal excretion ability. The excretion of the radiopharmaceutical used for kidney clearance begins approx. four minutes after application.

An exponential function is a function of the form
f(x) = a^x (2³ = 2 * 2 * 2 = 8)
where a is a fixed, positive constant, called the base of the exponential function.
Exponential functions are used to express dynamic processes, also in diagnostic imaging procedures.

The external dose is the dose equivalent received from radiation sources outside the body.