Chernobyl was a tragic event, caused by human error, and a very poor design (The reactors had no containment buildings, just 1 major example!).
Not mentioned in the movie, how much pollution is really there. There are many more pollutants than just radioactive materials, all much more mutanogenic than the radioactive ones. Moreover, the narrator just cites the nuclear disaster as the cause. This is at a time when nuclear power is necessary to our economy.
The birth defects shown are horrific and tragic, and all very heart wrenching, but truly how many children are effected? There are 1,000's of birth defects in the US and other countries, all can be attributed to causes other than nuclear radiation. Ever hear of the "March of Dimes"?
As for the scene when she holds up the Geiger counter, and says how scarred she is, either by a lie or incompetence, she is using it inaccurately. The selector switch is on Total Count, not on a count by minute (CPM rate), as it should be. Is the total count on over 1 minute, five minutes, several hours, several days? The "clicks" registered do not match up with the count displayed either. It appears to me that it is at maybe a couple of hundred counts per minute, not 13,000 counts every single minute (The LED would look steady at that rate!). Yes there is radiation levels higher than average world background, but there are beaches in France and India, Ramsar Iran, and other places that have very high background counts, and there are relatively few incidences of cancer and birth defects.
Are children with birth defects a good charity? Of course! But one should not lie, by omission or ignorance about it to collect funds.