METHOD OF DETERMINING CONCENTRATION OF BETA-RADIOACTIVE GASES Russian patent published in 2010 - IPC G01T1/185 

FIELD: chemistry.

SUBSTANCE: invention can be used in technical monitoring or scientific research related with the study of the kinetics of interaction of beta-radioactive gases. A gas system having an absolute pressure sensor with an upper limit of 133 Pa also includes an additional sensor (β-electron detector) whose output value is potential (Uout) (dwg.1) which is proportional to the number of β-electrons formed during decay of atoms of beta-radioactive gases. The detector is calibrated using gaseous mixture of beta-radioactive gases with known concentration at absolute gas pressure less than 133 Pa. Pressure and potential values are recorded in pairs for the required number of times; based on the obtained values for calibrating (graduating) the detector, the sensitivity coefficient (K_T) (dwg.2) is calculated as , where P is the corrected value of pressure of the beta-radioactive gas taking into account concentration of the calibration gas; is the average of the product of recorded pressure and potential values; is the product of average values of pressure and potential; is the average square and square of average values of potential respectively. Concentration of the beta-radioactive gas is calculated as , where P_Σ is absolute pressure of the analysed gaseous mixture in the gas system; P_β is partial pressure of the beta-radioactive gas calculated using formula (2), P_β=K_β·U_β.

EFFECT: direct determination of concentration of beta-radioactive atoms and molecular compounds based on said atoms in gaseous mixtures with precision and in a wide range of concentration independent of energy of beta-particles.

2 cl, 3 dwg