[en] Registration is one of the tools that can lead to a guarantee of radiation protection expertise. However, in some cases registration or certification becomes an objective in itself and gives the wrong impression that as long as experts are registered, control of the quality of the expertise is no longer necessary. Next to registration extra training or post-training is required for the four knowledge levels of radiation protection experts is required

[en] Information on hydrogen radical and organic radical chemistry are obtained by muomium chemistry. Muonic signals (diamagnetic, muomium and muonic radicals) are detected in pure water and organic solutions

[en] A critical consideration is given of the more recent data available in this field. Short term and late effects are discussed. A number of the studies used are outlined and the resulting risk factors and latency periods given. (C.F.)

[en] The reactivity of some metal ions towards the hydrated electron depends strongly on the ligands. Most of the aquo complexes are highly reactive and the rate constants approach the diffusion controlled limit. This also holds for the complex of Cu(II) with ethylenediaminetetraacetate, CuEDTA^2-. This complex is known to be labile towards substitution: one coordination position can be occupied by NH₃, ethylenediamine, CN^-, or OH^-. In this study the influence of the equilibrium: CuEDTA^2- + H₂O = CuEDTA(OH)^3- + H⁺ on the reaction rate with e^-sub(aq) has been measured for a series of ionic strengths. The equilibrium constant is defined by: Ksub(CuEDTA(OH)) = [CuEDTA(OH)^3-][H⁺]/[CuEDTA^2-]. Literature values for this constant are pKsub(CuEDTA(OH)) = 11.6 (μ = 1) and pKsub(CuEDTA(OH)) = 11.4. Consequently measurements were made in the pH range 7.5 to 11 and above pH 12. Experimental details are given. Kinetic salt effects for the reactions of e^-sub(aq) with CuEDTA^2- and CuEDTA(OH)^3- are shown. The results are discussed. (U.K.)

[en] A transient absorption spectrum was measured in single crystals of KAl(SO₄)₂x12H₂O by means of pulse radiolysis at ambient temperature. The decay can be described by two exponentials with half-lives of about 100 μs and 2 ms. The transient is attributed to excess-electrons, as it is suppressed in crystals doped with Cd²⁺ ions. (author)

No abstract available

No abstract available

[en] In this short article the ICRP 46 publication about radiation protection principles for the underground disposal of solid radioactive wastes is discussed. Special attention is paid to the probabilistic risk. Bayesian statistics are used in this article. 6 refs.; 2 figs

[en] Absorption spectra are reported for Cd EDTA^3-, Cd CDTA^3-. Pb EDTA^3- and Pb CDTA^3- formed by the reaction of e^-sub(aq) with Cd EDTA^2-, Cd CDTA^2-, Pb EDTA^2- and Pb CDTA^2-. Estimates are given for the stability constants of CD EDTA^3- and Cd CDTA^3-. The extinction coefficient at 320 nm for Cd EDTA^3- is epsilon₃₂₀ = (9.7+-0.9) x 10³ dm³ mol^-1 cm^-1. The rate constants for the reactions of e^-sub(aq) with Cd CDTA^2- and Pb CDTA²are 1 x 10³ dm³ mol^-1 s^-1and 1.9 x 10⁹ dm³ mol^-1 s^-1. The rate constants for the reactions of H₂O₂ with Cd EDTA^3- and Pb EDTA^3- are 2 x 10⁹ dm³ mol^-1 s^-1 and 2.5 x 10⁹ dm³ mol^-1 s^-1. Some experimental data are reported concerning the disappearance of Cd EDTA^3- in the presence of several alcohols. For the reaction Cd EDTA^3- + Pb EDTA^2- a rate constant of 4 x 10⁶ dm³ mol^-1 s^-1 was determined. This value was compared with a value estimated by means of the Marcus theory. (orig.)

[en] This article continues the critical discussion of recommendation ICRP-30, given in the preceding article of this issue of the bulletin. Three models are presented: the lung model, the bone model and the case of submersion in a radioactive cloud. The last one is accompanied by a calculation example in which the ALI (Annual Limit of Intake) and the DAC (Derived Air Concentration) are also computed. (Auth.)