Frieseke & Hoepfner FHZ 73 (with FHZ74 tube)

The FHZ-73 is a measuring device for liquids based on the FHZ-74 tube.

Geiger-Müller counter tube Frieseke & Hoepfner FHZ 74 V is a
Counter tube for Gamma radiation and Röntgen radiation.

The manufacturer of the Geiger-Müller counter tube type FTZ 74 V was the company Frieseke & Hoepfner from Erlangen. This company was later acquired by FAG ball fishermen and still offers counter tubes and radiation measuring devices.

This counter tube used primarily for the measurement of gamma and X-radiation, beta radiation, it is due to the metal shell not really sensitive. This is Zählrohrtyp et al used in the Verstrahlungsmessgeräten FH 40 T.
Inside a counter tube type Valvo 18509 is installed, identical to the types Philips / Centronic ZP 1310 or LND 714 or Mullard MX 151 data sheets for this type can be found on the net.

It can be any time to extend a FH 40 T or use for DIY projects. If necessary, you can also remove the protective cage with a fine cutters, the actual counter tube sits inside.

Technical Specifications (from the device records the FH 40 T)):

• halogen-filled countertube
• for the measurement of gamma radiation and X-radiation
• Working voltage: 330-370 V
• Working voltage: 500 V
• Plateau length:> 200 V
• Plateau slope <25% / 100 V
• Lifetime:> 3 x 10 ^ 9 pulses
• Zero effect: 0-5 pulses / min
• maximum dose rate: 50 r / h

Below some interesting links to related article and schematics regarding the use of the FHZ-74 (We do not take any responsibility for the content in below links!)

http://uzzors2k.4hv.org/index.php?page=geigercounter

http://uhrheber.wordpress.com/2011/04/28/a-usb-powered-geiger-counter-for-the-z2-and-other-computers/