Automatic equipment to monitor groundwater radon |
| |
Authors: | F Bella R Bella P F Biagi M Caputo G Della Monica A Ermini E Pettinelli V Sgrigna |
| |
Institution: | (1) Dipartimento di Fisica, III Università di Roma, Via C. Segre, 2-00146 Roma, Italia;(2) IBM-SEMEA, Via Oceano Pacifico, 171-00144 Roma, Italia;(3) Dipartimento di Fisica, Università La Sapienza, , Piazzale A. Moro, 2-00185 Roma, Italia |
| |
Abstract: | Prototype instrumentation, able to automatically measure groundwater radon content variations, is presented. The equipment is made of stainless steel and has spherical valves with automatic and pneumatic control. The deemanation of the gases from the water is obtained by evacuating a suitable expansion chamber. The instrumentation can make discrete sampling ranging from 1 per hour to 1 per 99 hours. The equipment was tested in the laboratory: the efficiency was measured by means of a266Ra solution. A mean value of (0.65±0.07) count/s/Bq was obtained. A calibration test was carried out by comparing countings from the automatic equipment with those obtained by the standard laboratory cell. Results of an operational check over a period of approximately one year indicate that variations in radon at the calibration site are attributable more to meteorological than to tectonic causes. |
| |
Keywords: | Automatic equipment groundwater radon environment earthquake precursors |
本文献已被 SpringerLink 等数据库收录! |
|