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PASSLER2, K. g. 239/240 Pu, 89/90Sr and 41Ca, in environmental, technical and biomedical samples by atom counting using selective laser based resonance ionization in combination with conventional mass spectrometry. Why nuclear analytical techniques? In the field of ultra-trace analysis of radioisotopes, the radiometrical determination of low concentrations of a and b emitters can have severe limitations: interferences from other radionuclides may exist, and the level of detection is dependent on the lifetime.

CHINEA-CANO, A. MARKOWICZ, IAEA Laboratories, Seibersdorf Problem One of the goals of analytical techniques is to obtain in a nondestructive way the chemical composition and physical characteristics of individual particles, for example airborne particles or particles from soil dust or from a specific emission source. Detailed information on the composition and physical characteristics of individual particles is of importance in environmental pollution studies and forensic investigations, and it can be helpful in solving many other analytical problems.

Both the positron and positronium can be implanted at some depth within a substance; even ‘hidden’ vacancies are accessible. Once they are captured in a vacancy, the positron and positronium are annihilated with a lifetime which is determined by the vacancy size such that the larger the vacancy size the longer the lifetime (Figs 1 and 2). The relationship of the positron or positronium lifetime to the vacancy size is now well known both theoretically and experimentally. How to solve the problem?

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