THE NEW REMCOUNTER LB6411 - MEASUREMENT OF NEUTRON AMBIENT DOSE-EQUIVALENT H-ASTERISK(10) ACCORDING TO ICRP60 WITH HIGH-SENSITIVITY

Since the International Commission on Radiological Protection, in publ ication ICRP60, has issued new recommendations on radiation protection quantities, there is now increasing interest in commercially availabl e instruments optimized and calibrated for the measurement of neutron ambient dose equivalent H(10). Therefore within a joint cooperation a greement between the Research Center Karlsruhe and EG&G Berthold, the neutron-dose-rate meter LB6411 was developed. The detector system with integrated electronics has a He-3 proportional counter tube centered in a moderating sphere. The response between thermal energies and 20 M eV was optimized with the help of extensive MCNP Monte-Carlo calculati ons. The instrument has an extremely high sensitivity of approximately 3 counts per nSv and can be used both as a portable or as a stationar y neutron monitor. Fluence responses have been measured in monoenerget ic neutron beams provided by the Physikalisch-Technische Bundesanstalt (PTB) in Braunschweig, Germany. The ambient dose equivalent response of the LB6411 is reported over the whole energy range.