Environmental gamma radiation measurements in Bangladeshi houses

Indoor gamma dose rate in air measured using TLDs in the Dhaka district is not wide ranging and follows a normal distribution with an arithmetic mean of $\text{1.54±0.26}\text{mGy}\text{y}{}^{\mathrm{-1}}$. The result has been compared with those found by other investigators for different locations of the world. Measurements were made on a monthly basis for a year period, and a sinusoidal variation of monthly indoor gamma radiation of the type: $\text{d=160+65}\text{cos}\text{π/6}\text{(m−1)}$, where d is the indoor dose rate $\text{(}\text{nGy}\text{h}{}^{\mathrm{-1}}\text{)}$ and m the month. This might be due to the seasonally varied air exchange rates of the houses. The average annual effective dose and the collective dose equivalent for the residents were estimated to be $\text{0.86}\text{mSv}$ and $\text{172.20}\text{man}$-Sv, respectively, based on the indoor gamma exposure.     

Emission and excitation spectra of feldspar inclusions within quartz

Emission spectra obtained for three irradiated granular quartz samples under $\text{1.43}\text{eV}$ excitation exhibited the 2.2 and $\text{3.1}\text{eV}$ emission bands characteristic of feldspars. Excitation spectra of these same samples and several others show the $\text{1.44}\text{eV}$ resonance typical of feldspars. This provides convincing evidence that the 2.2 and $\text{3.1}\text{eV}$ infrared stimulated luminescence observed in these granular quartz samples arises from feldspar inclusions.     

A time-resolved luminescence spectroscopy study of self-trapped excitons in KH2PO4 crystals

A complex investigation of the dynamics of electronic excitations in potassium dihydrophosphate (KDP) crystals is performed by the low-temperature time-resolved vacuum ultraviolet optical luminescence spectroscopy with subnanosecond time resolution and with selective photoexcitation by synchrotron radiation. For KDP crystals, data on the kinetics of the photoluminescence (PL) decay, time-resolved PL spectra (2–$\text{6.2}\text{eV}$), and time-resolved excitation PL spectra (4–$\text{24}\text{eV}$) at $\text{10}\text{K}$ were obtained for the first time. The intrinsic character of the PL of KDP in the vicinity of $\text{5.2}\text{eV}$, which is caused by the radiative annihilation of self-trapped excitons (STEs), is ascertained; σ and π bands in the luminescence spectra of the STEs, which are due to singlet and triplet radiative transitions, are resolved; and the shift of the σ band with respect to the π band in the spectra of the STEs is explained.     

Superfluidity with dressed nucleons

The gap equation with dressed propagators is solved in symmetric nuclear matter. Nucleon self-energies are obtained within the self-consistent in medium T matrix approximation. The off-shell gap equation is compared to an effective quasiparticle gap equation with reduced interaction. At normal density, we find a reduction of the superfluid gap from $\text{6.5}\text{MeV}$ to $\text{0.45}\text{MeV}$ when self-energy effects are included.     

Microwave spectra of D217O and D218O

Forty lines of the microwave spectra of D₂¹⁷O and D₂¹⁸O have been measured in the region from 8 to 400 GHz and analyzed according to Watson's centrifugal distortion theory. Comparison of the results obtained for D₂¹⁶O, D₂¹⁷O, and D₂¹⁸O demonstrates their internal consistency. The transferability of the parameters according to the isotopic substitution rules is evidence for the validity of the model chosen for the study of the ground state of heavy water.The effective rotational constants deduced from the observed spectra are very close to the values calculated using Oka's second order theory. The values obtained in MHz are:

$\text{A = 456766.9,}\text{B = 218041.0,}\text{C = 144701.5}\text{(D}{}_2{}^{17}\text{O;)}$

$\text{A = 451891.9,}\text{B = 218045.2,}\text{C = 144201.7}\text{(D}{}_2{}^{18}\text{O;).}$

The hyperfine structure of the D₂¹⁷O lines has been analyzed using as a reference the corresponding quadrupole coupling tensor of HD¹⁷O with the appropriate rotation. The values of χ_gg in MHz used for the analysis are:

$\text{x}{}_{\mathrm{\chi \chi }}\text{= - 1.2104,}\text{x}{}_{\mathrm{yy}}\text{= 10.1068,}\text{x}{}_{\mathrm{zz}}\text{= - 8.8964.}$