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Geiger counter type M6H (Halogen Quenched) by 20th Century Electronics; gamma sensitive, used for medical applications (checking radioactivity in liquids)

Geiger counter type M6H (Halogen Quenched) by 20th Century Electronics

1951-1978
One Cosmic Ray telescope employing Geiger counter tubes in coincidence. Comprising:(a) coincidence unit type 1036c, lent by Dynatron Radio Ltd, St Peter's Road, Furze Platt, Maidenhead, Berks (b) four Geiger-Muller tubes type G60H, gamma sensitive, presented by Twentieth Century Electronics Ltd, New Addington (c) two probe units type N558, lent by EKCO Electronics Ltd, EKCO Works, Southend-on-Sea, Essex

cosmic ray telescope with geiger Counter tubes

Coincidence Unit 1036C: 1957; Geiger-Muller tubes: 1956-1961; Probe Units Type N558: 1955-1961