Questions tagged [laboratory-safety]

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75 views

Why connect plug wires in a certain way when polarity changes in AC anyway? [duplicate]

In AC systems the two wires of a circuit alternate polarity many times per second. So positive and negative switch, half of the time a wire is positive the other it is negative. So why is it ...
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3answers
3k views

How much radiation do nuclear physics experiments expose researchers to nowadays?

I am curious about how much radiation do experimental nuclear physics researchers/students suffer in nowadays research environment. I know this may be a dumb question, but I have can found answer ...
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2answers
383 views

Is an obsidian plate safe to use as a Sun viewer? [closed]

Is a 0.5 cm thick obsidian plate good to see the Sun directly?
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24 views

What is a good introductory textbook to Laser Safety?

I was looking for a good textbook about Laser Safety (e.g. protection glasses design, distance of risk calculation, laser classification...). I can't find a complete book with these informations, ...
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1answer
92 views

Is discharge tube dangerous?

Are those gas discharge tubes dangerous? I found atom spectra interesting, so I booked a 1.5 hour lab session at a local high school. The physics teacher gave me a few hydrogen tubes, helium tubes, ...
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3answers
94 views

How are these utensils microwave-safe? [closed]

These types of utensils are starting to become popular nowadays. I checked their product description which says that its outer surface ( i.e. the red part) is microwave-safe plastic while the inner ...
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1answer
69 views

Carrying 10 liter dewar in elevator advisable? [closed]

I am using liquid nitrogen a lot at university and frequently have to carry a 10 l dewar from the storage container into my lab. On this way I have to walk down 4 stories with the heavy dewar. ...
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1answer
37 views

Amplifying stress at near perfect vacuum?

So, I've got a vacuum chamber as part of a home freeze drying project. It is a cylindrical steel pot with a 1.5in acrylic lid. The manual is poorly translated from Chinese, so some of it is seemingly ...
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0answers
265 views

Does a fusor emit dangerous radiation?

I noticed some online videos where people have built these things in their house or garage. Is it dangerous to do so? The high voltage appears to be a potential hazard, but what about radiation -- ...
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28 views

How to pass a fiber optic through an aluminum laser enclosure?

This is a very technical question which I think is not typical on this site but it is for experimental physics so I'm trying it out because I can't find a better stack exchange Problem I'm trying to ...
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1answer
142 views

How dangerous is a neutrino experiment near human habitation? [duplicate]

I just read about people trying to capture neutrinos and study them. America has a lab in Antarctica and France deep under the ocean. Is it dangerous to conduct such an experiment where people live or ...
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0answers
382 views

What is the relationship between AEL, Class, and MPE for laser safety?

I'm trying to establish safety limits for a laser system but can't resolve the information in the ANSI manual. Here is my understanding so far: MPE (Maximum Permissible Exposure) is based on health ...
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2answers
131 views

A safe way to heat batteries

I'm working on a physics experiment where I have to investigate the effect of temperature on a battery's internal resistance. I know how to measure the internal resistance, but the problem is in ...
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2answers
37 views

Safe Laser displays

I hope this is in the right stack exchange. Here's my question, assuming that all blue lasers are too risky to the eye to risk [using], is it possible to use only low-energy red and green lasers and: ...
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66 views

Calculating the electrical current in a Crookes Tube

I am planning on building a Crookes tube with the machine shop in my university's Physics department. I have pretty much all the details worked out, but since the tube has to operate at a high voltage ...
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0answers
179 views

Why don't laser safety goggles filter out the dot completely?

I was using a pair of these safety goggles which appear to be quite popular among laser hobbyists: http://www.survivallaser.com/Eagle_Pair_190540nm_OD5_Standard_Laser_Safety_Goggles/p556088_2780808....
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118 views

Viewing totality though an unfiltered telescope [closed]

DISCLAIMER: This question is for informational purposes only and the ensuing discussion must not be construed as safety advice. There seems to be a consensus among experts that partial eclipse should ...
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1answer
2k views

Is looking at an eclipse worse than looking at the sun? [duplicate]

I understand why looking at the sun is bad. I also understand that looking at the eclipse is bad. Is it more dangerous to glance at an eclipse than the sun, assuming you avert your eyes right very ...
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3answers
24k views

Why aren't 100% UV blocked sunglasses safe to view an eclipse with?

I am not planning on staring into the sun during an eclipse or any other time. I have been reading about how no variety of regular sunglasses are safe enough to view the eclipse with. I'm not talking ...
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1answer
1k views

Why can I look at the sun with my sunglasses but not at the solar eclipse?

Is the problem with seeing an eclipse that you have a sudden change between penumbra and regular sun? If that's the case, why can I look to the sun with my sunglasses on but I can't do it in an ...
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2answers
3k views

Can two polarized glass filters held at near 90° orientation serve as safe eclipse glasses? [closed]

Using two polarized filters to block all (?) light is a common classroom demonstration. With the imminent north American total eclipse, the media has been pushing eclipse glasses and emphasizing the ...
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0answers
81 views

Safety in ultracapacitor discharge regarding possible effects of induced voltages

Problem I am trying to analyze the safety of two experiments involving ultracapacitor short-circuit discharges. In the first experiment one has a discharge of a $0.45 \,\mathrm{F}$ capacitor with ...
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2answers
529 views

Can a 808nm laser diode with power = 400mW burn skin?

I have a 808nm laser diode with a spot size of 0.4mm and output power = 400mW, Can it burn the skin or hair if the exposure duration = 10ms?
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2answers
2k views

An appropriate way to store neodymium magnets

Okay so I've bought a few small neodymium magnets to play around with, they're very powerful and I really like them, but I was wondering what's the actual best way of storing those magnets in a way ...
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1answer
244 views

Are noise cancelling headsets safe? [closed]

Older microlight headsets such as the Lynx Micro System are modelled on ear defenders and physically attenuate the noisy cockpit environment by clamping hard onto your noggin. Most modern GA headsets (...
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0answers
129 views

What are the possible dangers of removing the microwave shielding?

Would removing the shielding from a domestic microwave door allow the microwaves to cause damage to a consumer grade video camera, and if so, what damage would it cause?
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2answers
277 views

Carrying A Couple of Grams of Uranium in Pocket - Was it Dangerous?

In short: I handled a small amount of uranium when I was young and kept it next to me in a bottle for years. Should I be concerned? The background is that when I was a young (10-ish), I was growing ...
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2answers
208 views

7 W medical laser without any precautions?

Today I got some medical laser treatment to treat some tendon irritation. The doctor used a red or IR laser with 7 W of power. He casually applied the laser onto the knee and was panning over the area....
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0answers
372 views

Antique X-Ray Tube Safety

I have this antique X-Ray tube in my lab. As far as I can tell it's a “Kesselring” free anti-cathode tube from about the 1920s. Is there a safe way to operate this tube and make some x-rays or is ...
5
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1answer
682 views

Why are UV protective eyeware Orange?

Many industrial processes use uv as a curing agent. When one uses such a process, one must protect one's eyes from the radiation. Most uv protective gear I have seen is tinted orange? Does this ...
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1answer
335 views

Can a high-watt laser's scattering light be damaging to the eyes? [closed]

Heyo, I recently purchased a S3 Arctic Class IV laser pointer. I bought the 3500mW. (In case that page expires, it's 445nm wavelength, 1.5mRad variant, NOHD is 279m, beam distance at 0.25 Lux 72km.) ...
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2answers
255 views

Why didn't 0.2A at 2V kill me? [closed]

I was recently connecting a circuit together like here: and I had the voltage set at 2V, with a 10Ω resistor. By Ohm's law, there was a current of 0.2A (and was confirmed by my multimeter). I ...
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2answers
472 views

How to determine the strength of a laser beam needed to cut through a specific material?

How can it be determined how strong a laser beam needs to be in order to cut through specific material? For example, if I have a 5mm thick piece of brown cardboard, is there a way to determine how ...
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4answers
15k views

Does a laser beam have to hit the eyes in order to damage them?

Does a laser beam have to hit the eyes in order to damage them? Or can a persons eyes get damaged by looking at a beam that goes past their eyes (e.g. looking at a laser beam moving inside an ...
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1answer
191 views

How to choose laser goggles for low-power laser of specific wavelength

I need to choose laser goggles to shield eyes against 678 (+/-8) nanometer laser (5mW power). The laser has a red beam. I found for example some goggles that are sold for 650nm, with a blue lens. ...
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1answer
203 views

Polonium tea emergency [closed]

Let's assume that I just realised that tea I drunk 30 minutes ago during meeting with a secret agent was doped with radioactive polonium. What should I do? What the doctors will do? Are there ...
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1answer
90 views

Any economical quantitative electrostatics experiments for the university level?

I'm seeking for some safe experiments for undergraduates in the electrostatics context. We have a Van-de-Graaff generator in our fundamental physics lab but this kind of devices are useful for ...
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0answers
409 views

Radiation Safety of some Particle Accelerators in CERN?

I am trying to study the radiation safety and what kind of roles are required there with particle accelerators. Radiation safety groups of CERN is here. I contacted their a few members of them. I ...
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3answers
3k views

Tesla Coils - Is there a risk that the discharge can create x-rays?

I've built a Tesla coil that stands about 3 ft tall and uses a spark gap as the interrupter for the primary circuit. Judging by the size of the streamers it's reaching at least a million volts. ...
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2answers
138 views

Safety glasses for a CO₂ laser

I am working on a CO$_2$ laser project and I know glass blocks the wavelength of the laser, 10,600 nm, well. So, should normal glasses work good as safety glasses or do I need to buy a specific one? ...
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1answer
1k views

How much power you might need to generate dangerous EMP shock?

While playing with voltage multiplication and capacitors, I began to think if my experiments could damage my electrical equipment (eg. mobile phone) by creating strong magnetic fields over a short ...
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1answer
169 views

Plasma Question: Expression for electron temperature in terms of the voltage of each prong of a triple Langmuir probe?

So I am trying to derive an expression for electron temperature based on the voltages on a triple Langmuir probe. I have pretty much been following the triple Langmuir probe derivation on wikipedia ...
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5answers
7k views

Is an electron gun dangerous? [closed]

Is an electron gun dangerous & what would be the repercussions to human tissue? If I were to do a DIY electron gun and put my hand in the beam would I regret it? [Edit] What sort of energy ...
2
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1answer
214 views

How dangerous is a parallel plate capacitor which is used in physics demo experiments?

How dangerous may it be when experimenting with a parallel plate capacitor typically used in physics demonstration experiments? Take for example this one (that's what I use): http://www.ld-didactic.de/...
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1answer
1k views

Is sub critical plutonium “safe” to handle?

Apparently, in Los Alamos scientists handled sub critical masses of plutonium (for example the demon core) with little or no protection. Richard Feynman and others mentioned that plutonium spheres ...
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1answer
81 views

Potential collapse during an earthquake? [closed]

I was asked to determine the shear forces on 12" diameter table legs supporting a few hundred pounds of static weight. How does one calculate or determine the potential force on the legs and/or ...
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3answers
8k views

laser pointer class III and potential eye damage

We just bought a green laser pointer on Ebay and had a discussion about the safety. The laser is low end chinese one (5 USD, free shipping :-) ) and the seller says this: Green Laser Pointer Point ...
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0answers
546 views

How to build a lab at home/school? (general purpose, sophisticated, reliable and cheap) [closed]

The title includes the main objective and all the criteria; namely: A. A lab is to be built. B. It must adhere to the following criteria: Reasonably cheap for a limited-fund school/...
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3answers
6k views

Solar Eclipse Viewing

I know it is not safe when viewing a solar eclipse to look directly at the sun. I know you can purchase solar eclipse glasses online but how do you make your own solar eclipse glasses that are safe to ...
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3answers
562 views

Does neutron radiation form clouds?

I've heard a couple of scary stories from experienced accellerator physiscists about something called neutron clouds. Apparently, if you have an experiment like a fixed-target experiment that produces ...