A scintillator is a material that exhibits scintillation, the property of luminescence, when excited by ionizing radiation. Luminescent materials, when struck by an incoming particle, absorb its energy and scintillate (i.e. re-emit the absorbed energy in the form of light). Sometimes, the excited state is metastable, so the relaxation back down from the excited state to lower states is delayed (necessitating anywhere from a few nanoseconds to hours depending on the material). The process then corresponds to one of two phenomena: delayed fluorescence or phosphorescence. The correspondence depends on the type of transition and hence the wavelength of the emitted optical photon. https://en.wikipedia.org/wiki/Scintillator

[1] See "The Ox and the Chamois" in Nature as Teacher, p.41, Vol. II of the Ecotechnology series. — Ed.
[2] H-substance: here refers to hydrogen or hydrogen-like substances. — Ed.
[3] Phos-elements: It is not quite clear what is intended here, but it may relate in some way to bioluminescence. However, the following three definitions are provided as an aid to interpretation.
PHOSPHOR: A substance which is capable of luminescence, i.e. storing energy (particularly from ionising radiation) and later releasing it in the form of light. If the energy is released after only a short delay (between 10-10 and 10-4 seconds) the substance is called a 'scintillator'.
PHOSPHORUS: P. Element. Atomic weight 30.9738. Atomic number 15. Occurs in several allotropic forms, white phosphorus and red phosphorus being the commonest. The former is a waxy white, very inflammable and poisonous solid. Red phosphorus is a non-poisonous, dark red powder, not very inflammable. The element only occurs in the combined state, mainly as calcium phosphate, CA3(PO4)2, Essential to life; calcium phosphate is the main constituent of animal bones.
PHOSPHATE: Salt of phosphoric acid H3PO4. Phosphates are used as fertilisers to rectify a deficiency of phosphorus in the soil. Note: The editor regrets that he cannot locate the dictionary from which the information was originally sourced.' [The Energy Evolution - Harnessing Free Energy from Nature, Letter to Werner Zimmermann]

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