Sale on Manual & Electric Hospital Beds - Starting from 25 September!

Home
Shop
Dental And Oral Care Equipment
Visionstar SJD-C20

✓ Certified Professional Seller

Visionstar Dental And Oral Care Equipment

Visionstar SJD-C20

Product Code: DAOC-DI-2852

Seventy kilovolts with the distance to match. Now check the field.

Seventy kilovolts, and a focus-skin distance over 20 cm to match. The Visionstar SJD-C20 runs 1 mA at 30 kHz with 0.1–1.8 s timing, a 0.3 mm focus and 1.6 mm Al total filtration.

Sections

Intraoral X-ray Units

Categories

Dental And Oral Care Equipment

Condition

New

Origin

China

Seller Type

Certified Professional Seller

CE & ISO Certified

Global Shipping

Supplier: Medigear

The Visionstar SJD-C20 is a battery-powered dental X-ray generator weighing 2.2 kg. It operates at 70 kV and 1 mA through a high-frequency switching circuit at 30 kHz, rated at 60 W, with exposure controlled by microprocessor and timing from 0.1 to 1.8 seconds. The tube is a DG-073B-DC insert with a 0.3 mm focus point and a 21° target angle, and anode heating capacity is stated as 8.5 kHU.

The headline specification is the focus-skin distance, published as greater than 20 cm. UK dental guidance sets a minimum distance from focal spot to patient skin that steps up for equipment operating above 60 kV, commonly expressed as 200 mm above that threshold. A unit fixed at 70 kV falls squarely in the higher category, and this data sheet publishes a distance that answers the requirement rather than leaving it to be discovered at commissioning.

Filtration also reads well, at a published total of 1.6 mm aluminium against the 1.5 mm equivalent minimum commonly cited for sets up to 70 kV. One caveat applies: the component figures given as origin and additional filtration do not sum to the stated total, so the numbers need reconciling with the manufacturer before your Radiation Protection Adviser works from them.

One figure needs closer attention than the rest. The irradiation range is published at 73 mm round. UK guidance limits the diameter of the beam at the patient's skin, commonly expressed as 60 mm for a round field, and 73 mm is a larger number than that. Establish with the manufacturer at what distance the 73 mm is measured and what the diameter is at the skin surface, and take your Radiation Protection Adviser's view before the unit is used. Where additional collimation is needed, it should be specified at order.

Radiation leakage is published at under 20 µGy/h, and the manufacturer describes multi-layer shielding within the housing. Medigear.uk can arrange supply, delivery, commissioning, staff familiarisation and service cover for the SJD-C20 across the United Kingdom.

Intraoral radiography carries the diagnostic load in UK general dentistry, and the SJD-C20 is configured for that daily volume. It supports bitewing caries detection, periapical pathology assessment, endodontic working length and obturation verification, alveolar bone level review, and root morphology assessment before extraction.

Operation at 70 kV shapes both the images and the installation. A higher-energy beam produces a long greyscale, which helps where crestal bone, root surface and restorative material must all be read from a single view — periodontal assessment and restorative margin review both benefit. It also reaches a given receptor density in a shorter exposure, which narrows the window for patient movement.

The installation side is where this specification distinguishes itself. Equipment operating above 60 kV attracts a longer minimum focus-to-skin distance under UK guidance, and this data sheet publishes a distance answering it directly. That removes the most common gap in this equipment class and lets the Radiation Protection Adviser start from a stated position.

Collimation is the counterweight and needs resolving before purchase. The published irradiation field is larger than the beam diameter UK guidance permits at the skin, so the measurement basis must be established and, if necessary, additional collimation specified. Practices committed to dose optimisation, and services answerable for paediatric exposures in particular, should not leave that to commissioning.

Community dental services and special care teams need equipment one clinician can carry. At 2.2 kg, the unit travels, with off-site radiation protection arrangements agreed with the RPA in advance.

Guidance from the College of General Dentistry and UKHSA Dental X-ray Protection Services remains the reference point that UK practices work to, alongside HSE enforcement of IRR17.

Distance published to match the kilovoltage

Operating above 60 kV requires a longer minimum focus-to-skin distance, and this data sheet publishes a figure greater than 20 cm — the pairing that makes a 70 kV unit usable as supplied.

Filtration above the cited minimum

A published total of 1.6 mm aluminium sits above the 1.5 mm equivalent minimum commonly cited for sets operating up to 70 kV, giving the beam quality assessment room rather than a bare pass.

A long greyscale for mixed densities

A 70 kV beam spreads a broad range of densities across the image, which suits periodontal bone-level review and restorative margin assessment where several tissue types must be read together.

Electronically regulated exposure

Microprocessor control and a low-ripple high-frequency supply hold tube voltage close to constant through the exposure, producing comparable receptor density between visits.

Low published leakage

Housing leakage under 20 µGy/h is stated, giving your Radiation Protection Adviser a definite figure when assessing controlled area and operator position.

A named tube insert

The DG-073B-DC is identified by model, giving your RPA and service engineer a reference point for beam quality data and replacement parts.

Carried by one clinician

At 2.2 kg, the unit sits comfortably within single-person handling for a full list or a community round, alongside whatever else has to travel.

Collimation question surfaced before order.

The published field diameter needs a measuring basis, and skin-surface figures need to be confirmed, and additional collimation specified if required. Medigear.uk can arrange for those answers with your quotation.

Focus-skin distance greater than 20 cm

Published distance meeting the longer minimum that UK guidance applies to equipment operating above 60 kV; request the exact figure rather than the greater-than expression.

70 kV tube voltage

Fixed kilovoltage above the 60 kV threshold, producing a long greyscale and determining which minimum distance applies.

1 mA tube current

Published tube current, with exposure time as the variable setting the exposure product for each region and receptor type.

0.1–1.8 second exposure range

An eighteen-fold span reaching short sensor values at one end and slower receptors at the other.

DG-073B-DC tube insert

The tube is identified by model, giving a definite reference for beam quality data, servicing and part replacement.

0.3 mm focus point

Published focal spot size, the specification governing penumbra and therefore edge definition at the receptor.

21° target angle

Published anode target angle, influencing the effective focal spot at the receptor and the intensity distribution across the field.

1.6 mm Al total filtration

Published total above the minimum commonly cited for sets up to 70 kV; component figures require reconciling with the manufacturer.

73 mm round irradiation field

Published field dimension — establish the measurement distance and the diameter at the skin, and specify additional collimation if required.

8.5 kHU anode heating capacity

Published thermal rating governing how many exposures can be taken in close succession; request the joule equivalent and cooling curve.

Microprocessor exposure control

Exposure is regulated electronically, supporting consistency between successive exposures across a session.

High-frequency switching at 30 kHz

Low-ripple supply holding tube voltage close to constant through the exposure, with a 60 W power rating.

Multi-layer housing shielding

Manufacturer-described internal shielding reducing leakage; external backscatter protection remains a separate matter for your RPA.

2.2 kg with shoulder strap

Published weight, the figure that determines whether one clinician can carry the unit through a full list or a community round.

The Visionstar SJD-C20 gives UK dental teams a 2.2 kg battery-powered X-ray generator running 70 kV and 1 mA through a microprocessor-controlled high-frequency switching circuit at 30 kHz, with a DG-073B-DC tube insert, a 0.3 mm focal spot, a 21° target angle, 8.5 kHU anode capacity, published total filtration of 1.6 mm aluminium and a focus-to-skin distance greater than 20 cm. It fits NHS and private general practice, periodontal and restorative work benefiting from a long greyscale, endodontics, paediatric and special care dentistry, community dental services and outreach programmes. Medigear.uk can arrange supply, delivery, commissioning, staff familiarisation, service cover, planned maintenance and collimation accessories across the United Kingdom, and can arrange for the manufacturer's beam diameter measurement basis, filtration breakdown, exact focus-skin distance and half-value layer data to accompany your quotation for your Radiation Protection Adviser's review. Contact the Medigear.uk team for pricing, lead times, sensor pairing options and configuration enquiries.

FAQ

Frequently Asked Questions

Everything buyers need to know about sourcing medical equipment through MediGear.

On the published figure, yes. UK dental guidance sets a minimum distance from focal spot to patient skin that steps up above 60 kV, commonly expressed as 200 mm, and this data sheet publishes greater than 20 cm. That is the correct pairing for a unit fixed at 70 kV, and it is worth noting because the requirement is easy to miss when a generator operates above the lower threshold. Give the figure to your Radiation Protection Adviser explicitly, and ask for the exact distance rather than the greater-than expression.

This is the question to settle first. UK guidance limits the diameter of the beam where it meets the patient's skin, commonly expressed as 60 mm for a round field, and the published 73 mm figure is a larger number. Two things follow. Ask the manufacturer at what distance along the beam the 73 mm is measured, since a figure quoted at the cone exit and one quoted at skin are different measurements. Then ask what the diameter is at the skin surface with the supplied applicator. If it exceeds the permitted maximum, additional collimation is required, and that should be specified at order rather than retrofitted.

They need reconciling. The data sheet states a total filtration of 1.6 mm aluminium while giving component figures for origin and additional filtration that sum to a different number. The stated total sits above the 1.5 mm equivalent minimum commonly cited for sets operating up to 70 kV, so the position looks sound, but a Radiation Protection Adviser works from figures that agree with each other. Ask the manufacturer to confirm the correct breakdown in writing, and have the half-value layer measured at critical examination as the deciding check.

Heat units describe how much energy the anode can absorb before it needs to cool, which governs how many exposures can be taken in close succession. The unit of measure differs from the joule figures some manufacturers publish, so ask for the equivalent in joules if you want to compare it against your own planning assumptions. As with any anode rating, the anode cools continuously between exposures, so the working limit depends on duty cycle — request the cooling curve if your sessions run long.

No. Shielding within the housing reduces leakage radiation escaping in unwanted directions from the tube itself. A backscatter shield is a separate item at the cone end, and it intercepts radiation scattered back from the patient towards the person holding the unit during the exposure. They address different sources, and UK guidance on hand-held dental equipment addresses backscatter protection specifically. Ask your Radiation Protection Adviser, and expect an external shield to be required.

Consistency. Microprocessor control regulates the exposure electronically rather than by mechanical timing, and a high-frequency switching circuit produces a supply with little ripple, meaning the tube voltage stays close to constant through the exposure. The practical effect is that the same protocol produces comparable receptor density each time, which is what makes serial comparison across visits meaningful and keeps retakes down.

Published leakage of under 20 µGy/h describes radiation escaping the tube housing in directions other than the useful beam. It is a housing measurement and is separate from operator scatter dose during an exposure, which depends on technique, receptor, collimation, shielding and where the operator stands. Your Radiation Protection Adviser uses the leakage figure when assessing the controlled area and operator position, and measures the doses that actually apply in your surgery.

The Ionising Radiations Regulations 2017 require employers carrying out dental X-ray work to register with the Health and Safety Executive, appoint a Radiation Protection Adviser, nominate a Radiation Protection Supervisor and complete a radiation risk assessment. The Ionising Radiation (Medical Exposure) Regulations 2017 add the appointment of a Medical Physics Expert, justification and optimisation of each exposure, and documented training for referrers, practitioners and operators. A critical examination is required when the equipment is put into service.

Dental X-ray equipment is subject to routine quality assurance and periodic radiological testing under IRR17, alongside annual electro-mechanical inspection, with a critical examination required at installation. UK service providers commonly apply an annual radiological testing interval to hand-carried units. Warranty terms are set and issued by the seller or manufacturer, typically 12–24 months for this equipment class — confirm the term, the parts covered and the battery position at quotation.