This paper reports interpretation of experimental W-value and scintillation intensity in binary gas mixtures. The W value for a mixture, W_m, is given by Huber, Baldinger and Haeberli as 1/W_m =(1/W_x - 1/W_y) Z + 1/W_y, where Z = [1 + (S_yP_y/S_xP_x)]^-1. Here, W_x and W_y are the W values for the gas X and Y having stopping powers S_x and S_y, respectively. This formula well explains the experimental data for the binary gas mixtures in which Penning ionization scarcely occrs. The additional ionization yield over the estimation from the above formula is due to the metastable and non-metastable Penning ionization. Scintillation intensity in binary gas mixtures excited by alpha particles measured by Northrop and Gursky (Nucl. Instr. Methods 3 (1958) 207) is well explained by considering the energy partition by using Z.

  The calculation of thermalization time for subexcitation electrons in argon, krypton and xenon gases and argon-, krypton- and xenon-nitrogen gas mixtures has been reported in the previous paper (Ionizing Radiation 8 (1981) No.1, 20). This paper reports the measurement for the thermalization time in xenon gas, argon-nitrogen and xenon-nitrogen gas mixtures by the method based on the time dependence for the recombination luminescence, resulted from thermalized electrons. The good agreement was obtained between measured thermalization times in the above gases and calculated ones for subexcitation electron energy of 1 eV (for xenon and xenon-nitrogen gas mixtures) and of 0.4 eV (for argon-nitrogen gas mixtures). The effect of nitrogen in xenon (or argon) gas on the thermalization process is found to be appreciable for [N₂]＞10^-3 [Xe] (or [Ar]) as a result of inelastic collisions by a rotational energy-transfer process for the electron energy of less than 1 eV (or 0.4 eV). A brief considerations are given on the energy distribution for the subexcitation electrons and the track structure for secondary electrons relevant to the recombination luminescence.

  The dependence of mean excitation energy on physical and chemical states of the medium has been evaluated by modifying the Bloch formula. The validity and invalidity criteria of the Bragg additivity rule are discussed in some detail.

  Some proportional counter systems designed for the resonance-electron Mössbauer spectroscopy (REMS) are reviewed in detail. Major concerns are techniques for operating gas-filled counters at low and high temperatures (77~1100 K). Discussions are also made on a possibility of REMS measurements at lower temperatures, e.g., even at the liquid-helium temperature (4.2 K).

  In order to facilitate the energy calibration in organic scintillation detectors, a new method to accurately locate the Compton edge in the pulse height spectrum of Compton-recoil electrons has been developed. The basic principle of the method is to identify the Compton edge by extracting the very feature of the spectral shape with a sharp cut at the Compton edge, which should be exhibited in the Compton electron energy loss spectrum.

  The method is implemented by successive deconvolutions of the measured pulse height spectrum with suitable Gaussian resolution functions.

  The validity of the method has been demonstrated by the analysis of pseudo-Compton pulse height spectra and those measured with liquid and plastic scintillators. It is emphasized that the method can also provide a good estimate of the system resolution.

  A brief review of existing methods of locating the Compton edge is also given.