FH 380 GN DOSIMETRO PERSONALE (IM7051 TDQ7050)
Inviato: 14/10/2015, 21:02
Hello friends,
I thought it a good idea to inform you about the IM7051 FH380GN TDQ7050 dosimeter system. It is known under each of these three designations, but let me refer to it as the FH380GN.
In the past I wrote something about it in the [email protected] forum, and herewith best partly refer to that as it contains interesting information. Please note that I haven't got access to any of those (cheap) machines anymore, as that source unfortunatly sold out. But they are still obtainable on the internet and via Helmut Singer for as far as I know.
> > I found a limited supply of FH380GN dosimeter readers for little money. I
> > bought some of those for own experimenting, and find these machines very
> > interesting. It's Dutch army stock from the late eighties, and in pristine
> > condition. Very solid Military Spec. These must have cost a fortune once.
> > Will have been my tax money alright, but as we Dutch are well known being
> > the giving kind of people...
> > You'll find the same ones here:
> > [External Link Removed for Guests]
> > and here: [External Link Removed for Guests]
> > The latter sells them for 225 Euros a piece, but I might be able to get them
> > (but without the casing) for about 1/10 of that price!
> >
> > I thought it a nice idea to do something for the group, and pass them on for
> > little cost plus shipping, if there would be any interest.
> >
> > Please note that I haven't secured an amount of these machines yet, as I
> > thought it best to herewith inquire first, so chances are that I'd have to
> > pass if they would have been sold out.
> >
> > In each machine there is a very nice Hamamatsu R1166 PMT with sturdy
> > Mu-shield, connector and complete dynode string + HV supply PCB. I haven't
> > got the schematics, but keep in mind that it's probably more set for light
> > intensity measuring than for pulse counting. But the PMT + connector could
> > always be used with a self made dynode string, so there's guaranteed value.
> > Helmut Singer sells the machines for 225 Euros a piece, but with casing,
> > mains cable, two calibration dosimeters and 5 dosimeters (watch-type).
> > I might be able to get the machine without casing (but exactly the same and
> > working), maybe with one calibration dosimeter, but without the dosimeters
> > themselves.
> > But ... I also found one who sells the dosimeters for Euro 8 a piece, unused
> > and sealed packed. Might be a very limited supply of those though.
> > The unit needs external power supply, and can be driven with 24V DC and 220V
> > AC, but as far as I can see it can be easily converted to 110V AC just by
> > removing a bridge at the transformer.
> > There's also some computing power inside. Might even be possible to
> > reprogram the beast somehow (there's an EPROM).
> >
> > Interesting might be, to:
> > Get one of those working uncased + one calibration dosimeter + one dosimeter
> > (I'd have to buy that separately). Total cost would be about Euro 30 to 35
> > plus shipping cost. The dosimeter watch has a 10x10x1 mm RPL glass plate for
> > gamma dose, which easily can be taken out and put in again. So there would
> > be the possibility to have a gamma dose registration device that small, to
> > put somewhere and read out with the machine later. Might be interesting, and
> > above all it seems that the RPL glass can be regenerated and re-used just by
> > annealing at about 400 degrees centigrade. It can have a total dose of about
> > 10 Gy (reading is per cGy) though, before regeneration would be needed.
> > By the way, the dosimeter also is capable of measuring neutron radiation
> > with an also incorporated Si-PIN-diode. That one can't be regenerated
> > though, but will last through a good deal of experimenting I guess.
> > Another option would be to just go for the Hamamatsu R1166 PMT + MU shield +
> > connector. Cost would be about Euro 25 + envelope shipping cost(haven't
> > looked at those shipping cost but will be low I guess).
I've got one of those machines, and would like to exchange experiences with other owners, if possible. I haven't been able to experiment a lot with it, but would like to do more in the future. Irradiating the RPL glass, and reading it out, might be interesting. By the way, for those who have an FH380GN but are in need of the dosimeter watches for it: they are still being sold for as far as I know.
I'll add a link to the FH380GN handbook in a later post, and add pictures if possible.
Maybe, someone can then place it in the forum file section?
Greetings,
Andre
I thought it a good idea to inform you about the IM7051 FH380GN TDQ7050 dosimeter system. It is known under each of these three designations, but let me refer to it as the FH380GN.
In the past I wrote something about it in the [email protected] forum, and herewith best partly refer to that as it contains interesting information. Please note that I haven't got access to any of those (cheap) machines anymore, as that source unfortunatly sold out. But they are still obtainable on the internet and via Helmut Singer for as far as I know.
> > I found a limited supply of FH380GN dosimeter readers for little money. I
> > bought some of those for own experimenting, and find these machines very
> > interesting. It's Dutch army stock from the late eighties, and in pristine
> > condition. Very solid Military Spec. These must have cost a fortune once.
> > Will have been my tax money alright, but as we Dutch are well known being
> > the giving kind of people...
> > You'll find the same ones here:
> > [External Link Removed for Guests]
> > and here: [External Link Removed for Guests]
> > The latter sells them for 225 Euros a piece, but I might be able to get them
> > (but without the casing) for about 1/10 of that price!
> >
> > I thought it a nice idea to do something for the group, and pass them on for
> > little cost plus shipping, if there would be any interest.
> >
> > Please note that I haven't secured an amount of these machines yet, as I
> > thought it best to herewith inquire first, so chances are that I'd have to
> > pass if they would have been sold out.
> >
> > In each machine there is a very nice Hamamatsu R1166 PMT with sturdy
> > Mu-shield, connector and complete dynode string + HV supply PCB. I haven't
> > got the schematics, but keep in mind that it's probably more set for light
> > intensity measuring than for pulse counting. But the PMT + connector could
> > always be used with a self made dynode string, so there's guaranteed value.
> > Helmut Singer sells the machines for 225 Euros a piece, but with casing,
> > mains cable, two calibration dosimeters and 5 dosimeters (watch-type).
> > I might be able to get the machine without casing (but exactly the same and
> > working), maybe with one calibration dosimeter, but without the dosimeters
> > themselves.
> > But ... I also found one who sells the dosimeters for Euro 8 a piece, unused
> > and sealed packed. Might be a very limited supply of those though.
> > The unit needs external power supply, and can be driven with 24V DC and 220V
> > AC, but as far as I can see it can be easily converted to 110V AC just by
> > removing a bridge at the transformer.
> > There's also some computing power inside. Might even be possible to
> > reprogram the beast somehow (there's an EPROM).
> >
> > Interesting might be, to:
> > Get one of those working uncased + one calibration dosimeter + one dosimeter
> > (I'd have to buy that separately). Total cost would be about Euro 30 to 35
> > plus shipping cost. The dosimeter watch has a 10x10x1 mm RPL glass plate for
> > gamma dose, which easily can be taken out and put in again. So there would
> > be the possibility to have a gamma dose registration device that small, to
> > put somewhere and read out with the machine later. Might be interesting, and
> > above all it seems that the RPL glass can be regenerated and re-used just by
> > annealing at about 400 degrees centigrade. It can have a total dose of about
> > 10 Gy (reading is per cGy) though, before regeneration would be needed.
> > By the way, the dosimeter also is capable of measuring neutron radiation
> > with an also incorporated Si-PIN-diode. That one can't be regenerated
> > though, but will last through a good deal of experimenting I guess.
> > Another option would be to just go for the Hamamatsu R1166 PMT + MU shield +
> > connector. Cost would be about Euro 25 + envelope shipping cost(haven't
> > looked at those shipping cost but will be low I guess).
I've got one of those machines, and would like to exchange experiences with other owners, if possible. I haven't been able to experiment a lot with it, but would like to do more in the future. Irradiating the RPL glass, and reading it out, might be interesting. By the way, for those who have an FH380GN but are in need of the dosimeter watches for it: they are still being sold for as far as I know.
I'll add a link to the FH380GN handbook in a later post, and add pictures if possible.
Maybe, someone can then place it in the forum file section?
Greetings,
Andre