1000 Rem or 10 Sieverts will almost certainly kill within a few weeks. 500 Rem or 5 Sieverts will kill about 1/2 those receiving it.
You may be referring to a wide class of radiation known as ionising radiation. Just which parts of this class that should be considered lethal to people is subject to contraversy. Please see the link.
Radiation ionizes atoms, breaking their bonds and altering biological chemistry. It can also change the nucleus by activation involving neutrons. In sufficient amounts, the body is unable to compensate, and that radiation can be lethal.
Phone radiation can be harmful to humans. It is harmful when the person is on the phone a lot.
infrared radiation is invisible to humans
thermal radiation = heat
Radiation is lethal to Humans, So no.
You may be referring to a wide class of radiation known as ionising radiation. Just which parts of this class that should be considered lethal to people is subject to contraversy. Please see the link.
Radiation ionizes atoms, breaking their bonds and altering biological chemistry. It can also change the nucleus by activation involving neutrons. In sufficient amounts, the body is unable to compensate, and that radiation can be lethal.
Like any creature, yes, they can survive a certain limit. They can withstand higher amounts of radiation than humans, but will still succumb to its effects at some point.
67,500 rems or 90,000 to 105,000 for German cockroaches
LD50/30 radiation refers to the dose of radiation required to kill (LD=Lethal Dose) 50% of the test cohort within 30 days. Its normally specified for a particular species, rats, rabbits etc and is thought to be about 3-4 Sieverts in humans. The wikipedia article "Radiation Poisoning" has a table of effects of increasing radiation on humans. Note that at 3-4 Sv there are no skin effects if it is whole body exposure. If it is localised exposure then there will be radiation burns followed by erythema.
Ozone
light radiation
The lethal dose of lead to humans has been reported to be approximately 450 mg/kg of lead. Testing was done using lead acetate.
Increased skin cancer in Humans because the ozone layer is meant to limit sun radiation to earth.
Phone radiation can be harmful to humans. It is harmful when the person is on the phone a lot.
infrared radiation is invisible to humans