Dear Wee Mei,
We are a manufacturer, not an assembler, and we only contract with
assemblers who have x-ray machines
as we know that they reduce the scrap
rate of our boards which are very expensive and use a lot of BGAs and
QFN packages.
I don't know the cost difference between 2D and 3D but if your company
can afford 3D then because
the trend is to smaller more dense
component footprints, 3D will become
more useful as time goes by.
We buy expensive capital equipment instruments not just for their use
today but for their capability in the future.
As for dosimeters, many years ago I worked in nuclear physics with
radiation sources (x-ray, particle accelerator, radioisotope, nuclear
reactor). I did dosimetry which included film, electroscope, geiger,
scintillator, and thermiluminescent type devices. It's been many
years since I have done that work but if you contact me off the forum
and send me information on what choices you have for dosimetry, I'll
be happy to review the information and give you what advice I can and
suggestions for questions to ask the vendors.
One suggestion that I would make to familiarize yourself with x-ray eq
would be to go to your local hospital x-ray department and speak to
the x-ray technicans there. Ask them what kind of dosimetry they use
(most likely it will be film), who does the service work, do they do
radiation surveys, how often they are required to do them. There must
be national radiation safety regulations in Singapore. The
regulations should specify what must be done.
The equipment is similar to a microwave oven, it has safety interlocks
so when the door is opened to place boards inside, the radiation must
shut off. These interlocks must be checked at least once a year.
Used properly, and maintained, the equipment is very safe and very
helpful.
Hope you will get recommendations offline from people here who use
them as to what they like (and don't like and wish they had) in the x-
ray units they have.
It's a big investment; buy for the future. The future comes
quicker than you think!
Best regards,
Bob Landman
H&L Instruments,LLC
Sent from my iPhone
On Mar 28, 2010, at 12:46 AM, John Burke <[log in to unmask]> wrote:
> Yes they have come down...the one at the top of the list is about
> 130us I believe in 3d
>
> Bev Christian <[log in to unmask]> wrote:
>
>> Wee Mei,
>> OK, $1 Singapore = $0.73 CDN = $0.71 US. Let's just round to
>> $0.7. So you
>> have $70K to $175K, CANUSA. Not a bad pile of money. But unless 3D
>> has
>> REALLY come down in price, then you should be aiming at 2D.
>>
>> Some companies you should consider (only in alphabetical order) are:
>> Dage
>> Focal Spot
>> Glenbrook
>> Creative Electron
>> Nordson Yestech
>> Northstar Imaging
>> Omron Electronics
>> Scienscope
>> Viscom
>> VJ Electronix
>> X-tek (bought by Nikon)
>> Xylon (bought Fein Focus)
>>
>> I'm sure other TechNetters will name a few others and maybe give
>> you some
>> specific tips (probably off-line).
>>
>> Regards,
>> Bev
>> RIM
>>
>> -----Original Message-----
>> From: TechNet [mailto:[log in to unmask]] On Behalf Of Lum Wee Mei
>> Sent: Saturday, March 27, 2010 9:55 AM
>> To: [log in to unmask]
>> Subject: Re: [TN] Personal radiation device for X-ray machine
>>
>> Guy and Bev,
>>
>> Thanks for your prompt reply. As mentioned I know nothing about the
>> required
>> specifications for the X-ray machine used for PCBA inspection. Is
>> 2D good
>> enough for BGAs, LGAs, QFNs or I need a 3D? As for cost, I am not
>> sure, can
>> we have one between $100 - $250K (Singapore Dollars)?
>>
>> I do not think my country, Singapore required company to register
>> their
>> X-ray machine. However, I have heard that whoever operate the X-ray
>> machine
>> must have a licence to do so and must wear a dosimeter to detect any
>> possible leakage during operation.
>>
>> That is the reason why my company chief safety officer has
>> indicated that we
>> need to purchase the dosimeter should we need to use the X-ray
>> machine at
>> our vendor's facility.
>>
>> Thanks and Regards,
>> ~ Wee Mei ~
>>
>> ________________________________
>>
>> From: TechNet on behalf of Bev Christian
>> Sent: Sat 3/27/2010 9:14 PM
>> To: [log in to unmask]
>> Subject: Re: [TN] Personal radiation device for X-ray machine
>>
>>
>>
>> Guy,
>> Good points. Those same details apply to the province of Ontario
>> and I
>> expect they apply to most other states and provinces in our two
>> countries.
>> Bev
>> RIM
>>
>> -----Original Message-----
>> From: TechNet [mailto:[log in to unmask]] On Behalf Of Guy Ramsey
>> Sent: Saturday, March 27, 2010 8:55 AM
>> To: [log in to unmask]
>> Subject: Re: [TN] Personal radiation device for X-ray machine
>>
>> We operate our X-ray equipment under regulations issued by the
>> Commonwealth
>> of Pennsylvania. We are not require to wear dosimeters. The
>> instrument
>> is
>> registered with the state and must be tested for leakage its surfaces
>> and
>> seals. We are also require to have a safety training program and
>> radiation
>> safety officer.
>>
>> Guy
>>
>> -----Original Message-----
>> From: TechNet [mailto:[log in to unmask]] On Behalf Of Lum Wee Mei
>> Sent: Saturday, March 27, 2010 5:03 AM
>> To: [log in to unmask]
>> Subject: [TN] Personal radiation device for X-ray machine
>>
>> Hello,
>>
>> I have to say here that I have completely no knowledge in X-ray
>> machine
>> for
>> PCBA but has been tasked to (1) evaluate and with intention to
>> purchase
>> a
>> suitable X-ray machine for this application and (2) purchase personal
>> radiation monitoring device.
>>
>> My immediate task is item (2) as we will be using a contractor's X-
>> ray
>> to
>> carry out X-ray for some of the PCBAs mounted with BGAs and LGAs very
>> soon.
>> I need to purchase this so-called dosimeter ASAP. I am given a
>> particular
>> brand and told to get either one of the models. As I stared down on
>> the
>> specifications between the different models, I am lost in their
>> translations, what energy range, dose rate, etc, etc. I surfed the
>> internet
>> to understand more but came face to face with so many literature and
>> brands
>> that I am "drown" in them. Ignorant I may be, I am sure those
>> specifications
>> stated in the dosimeter data sheet has to do with the brand or type
>> of
>> X-ray
>> machine that I use at the contractor's facility or that I am going to
>> purchase.
>>
>> I really hope some kind souls out there can help me to have some
>> basic
>> understanding in how I should select the correct dosimeter for my
>> application. I am looking at one that can be wore around the neck
>> (for
>> both
>> genders) or clip on breast pocket for male.
>>
>> Thanks and Regards,
>> ~ Wee Mei ~
>>
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